I also think it's a fantastic mod. However, I wish it didn't make all of the townies feel a burning desirre to have some sort of romantic relationship. I was using MasterController to give someone a boyfriend and only the NPCs were single!
I love SP but I have stopped using it for now until I get some things sorted out in my game.
I ended up throttling the cooldown between relationships/unexpected pregnancy/shotgun wedding chance and it seemed to help with everyone falling in love immediately. I had sims lose romantic interests left and right because they ran off and got married -fast-. I am also the type of person that will sometimes wait for "Ask So and So To Be Your Boyfriend/Girlfriend" wish to roll after going on several dates.
I also tweaked the move settings so all the empty houses weren't immediately filled with broken homes and sims breaking out on their own.
Good luck, ErinIsNice, there are a lot of settings but it really becomes easier as you play with it and look at everything and if you look at the breakdowns in the links Twallan posted, you will learn a lot.