Can I place Sims from another EA town into my dynasty town? -- Absolutely not. The only Sims allowed to be added in dynasties are founders for the Immortal Dynasty and Life States Dynasty. A player should only be using Edit town for placing lots that are missing due to expansions or for placing skills books that are missing from a town library. Every other change you want to make to your town has to be done through buying real estate in game or with permission to fix something broken.
Can I use Edit Town to replace the City Hall in Sunset Valley with the combination one from Bridgeport? --No. This is to be done on a case by case basis with approval from Metro, Ratchie, Pam or myself. Some rabbit holes can be replaced if there is a bug involved or to add something to the town. With the exception of empty lots, all other lots from a town must remain unchanged until such a time as your Sim family owns it and then makes changes via build mode. If you want to combine rabbit holes just to create more room for other buildings, think of what buildings have no value to a dynasty. Extra libraries, gyms, casinos and parks don't actually help with skills or requirements most of the time so if you still need room for lots that do help with requirements, think about trimming those down first.
Example of allowed replacements: You can replace the stadium in Sunset Valley with the Binder Clips stadium from Starlight Shores because it's both a stadium and a big show venue. Or if you are experiencing the combined building bug - you can ask permission to replace the combined building with two separate rabbit holes. Dynasties are about strategy and part of that strategy is the town you choose. All towns should still look like themselves once you've left Edit Town to start playing your game.
Can I use the buildings from Union Cove in another town? -- Yes; however, Union Cove buildings are the only player made buildings that you are allowed to be placed in Edit Town.
Am I allowed to choose an empty lot and place a rabbit hole on it to get access to the new career? -- No. You are still not allowed to create your own lots from Edit Town. If you wish to place the gypsy caravan, or any other rabbit hole from an expansion in your town, you have two choices. If there is not a version of it in the community lot bin, you can save it to the bin from a new unaltered version of the expansion town or you can purchase a property in your dynasty game town and place the rabbit hole via the community objects category in build mode. If you choose to purchase the property to place the item, that property will then be sold by the game so remember that if buying a property is part of your requirements.
Am I allowed to add graveyards from other towns to my town? -- Placing any lot with a dead Sim on it is banned unless the Sim is removed before the lot is played. Adding dead Sims to a town they're not from is a lot like adding Sims which is also banned.
When I load up a new game, there are sometimes lots auto placed onto the empty lots the town came with. Am I allowed to move them/delete them? -- As long as you are not removing any of the town's original community lots, yes you can delete or move them. The equestrian center is on the dynasty lot when you start the game, yes you can delete it and move either the large one or small one to another lot in the town. Do not place the equestrian center on top of a lot that was already there like the fishing hole between the Landgraabs & Altos. If you don't want that Katy Perry BonBon park behind the police station, go ahead and remove it from the town. If you need to place a 60x60 lot at the end of Pinochle Road for a studio but the junkyard is in the large 40x40 lot at the end, move the junkyard to another lot in order to place the new lot where you need to.
Can I use the terrain tools to soften the terrain around a lot to give my sims access to a placed lot or to blend in placed lots with the surrounding world? -- Yes with limitations. If sims can't get onto a lot near the science center without running around the military base four times, then yes go ahead and soften the terrain to allow access to the venue. Even though none of the other terrain tools are advantageous in anyway, Edit Town is not to be used to make lots pretty. They are only to be used on lots that your Sim doesn't own to correct routing issues with placed lots.
Can I change the lot type of a lot in town to something else? Example:
The Water Hole Juice Bar in Riverview to a Hangout or Recurve Strand in SV to a beach or Small Parks of Moonlight Falls to anything. -- The answer to this used to be a flat no. With the introduction of Moonlight Falls and the small park situation, it was agreed upon that players can now change some lots. Small parks & undesignated lots can now have their lot designation changed to one of these four choices only:
Hangout, Beach, Big Park or Cat/Dog Park. The reason for this is to allow players the ability to purchase these lots in game to place rabbit holes as needed or to give more options for real estate purchases. You cannot delete these lots as per the rules but you can now purchase them which will allow you the ability to personalize placement of a few things you may not have been able to fit.
Example: Changing a 64 x 64 small park in Moonlight Falls to a Big Park. You can now purchase the Big Park and place a studio which needs at least 40 x 40 and one of the diners or the TL bistro since you still have room (if you wanted to). Note: Because you have to place the Casino, the casino does not fall within the allowance of this policy. It has to remain the same.
List of Lots for each town that are allowed to receive a Lot Designation Change: If it's not on this list - ASK.
Always remember when it comes to Edit Town we're generally very set in our ways. If you want to know if something is allowed and don't see it in the rules or on this post, ASK before doing it. This could save you the trouble of losing the ability to get into HOF.