1. I would do this with bot route flags. Check out my bot routing tutorial
. You can't affect which spawn points bots can appear at. What you can do is set up the bot route such that any parts of the route that are near spawn points OUTSIDE the swamp are a series of one-way waypoints that lead into the swamp, and the ones inside the swamp are normal. So, when the bots spawn outside the swamp, they head into the swamp and nowhere else, and when they get into/spawn in the swamp, they stay in there.
2. Exactly what LJ said.
is great, but is being overhauled now...wait a couple days for PCGM 2.0 to come online.