I don't think this has been brought up yet. Basically, the way I envision it is being an addition to the map maker, allowing you to place little hotspots (perhaps colour-coded, so you can have multiple "in" spots leading to one "out" spot). I know it seems insane, but it could definitely open up new possibilities for custom maps -- specifically, what I have it in mind for is a map I'm creating with a pathway to a hard-to-reach room with a cache of powerup spawn points, but while it's challenging to get into the room, it's next to impossible to get out of.
*waits to see how quickly this is dismissed as the most crackpot and implausible idea since the addition of vehicles*
*waits to see how quickly this is dismissed as the most crackpot and implausible idea since the addition of vehicles*