If I'm not mistaken (again), you can put your own custom music in place of the game's for neighborhood/build/buy as well as all the stereo channels, can't you? I could be remembering TS1 again, though. That was my all-time favorite Sims game (because it was simple enough that I could make objects for it), though I haven't played it in years.
Seems I remember you're supposed to be able to place objects on a diagonal with some command (snapobjectstogrid off maybe?), but not sure. Have yet to try. Would I need _boolprop testingcheatsenabled on_ to execute such commands?