I think everyone here has named just about every tweak I would like to see to the game.
I do especially like the suggestions regarding the pavement widths, the Town Hall, and the joint tasks.
One of the things that bothers me too: I don't mind characters having a joint task with another character, but there are a couple of characters that it seems have half their available tasks with another character (case in point: Bernice Hibbert). I don't understand why this is, particularly given the problem with not having the task listed on the other character's list. If it's a later character like Bernice, and I'm setting everyone up on , say, 4 or 8 hour tasks, by the time I get to assign her, half her tasks are unavailable because I've already assigned her task partners to do something else!
Why not make an option for a lone task for the same time limit? So for example, Bernice's task with Marge is 4 hours. She could have another four hour task alone so that you could pick either one. I believe there are already several characters who have more than one 2 or 4 hour task to choose from (Homer comes to mind).