on some multi-leveled streets it would be nice to hit the down arrow and get to the lower level without walking around trying to find the hole/ladder to get us down there.
The "donkey kong" seam street comes to mind as an example.. or the Hog Haul game? Probably wouldn't matter on a lot of streets but on some maybe not so good. If devs would be able to manually specify this then I'd really love being able to do the one-click-lower-level thing especially in a couple streets in the hilly regions where I have trouble even knowing IF there's a ladder on the level, and the Groddle egg plant locations for example!