A large part of information missing from the API has been recently added to support this. It's no easy process though, and there's going to be issues with trying to handle dynamic obstacles and pathfinding through blocked off areas correctly that the programmer has to overcome. More improvements for stuff like that will eventually come though.
This would be awesome, but the logic involved is much more complicated than move to point A - B and kill. Right now the bot can easily get you to high levels and I just recently cleared Merc Lab in a breeze. I would love an automated Lab run because I enjoy being lazy and watching the bot.
