I have no issue with any player choosing to uninstall any expansion. In fact, in the 2014 Tournament ruleset I am currently tweaking I am going to mention the Sims 3 Selector utility available at Mod the Sims. It's not a mod at all, but a utility that tells the launcher which xps to load. Very simple workaround.
I tried downloading this and installing it, but Norton Security gave it a red X and tossed it. Perhaps other people might try experimenting with it?
On the issue of skill opportunities, saltpastillen and I have discovered that our sims can get them while at a rabbithole job or on a community lot, which does help with the problem.
Finally, has there been a decision on whether the Time Traveler can count as an NPC friend?
(Sorry for the double post, but since it's been over a week, I hope that's okay.)