DescentBB

What version on decent 1 has the most bot roaming?

I don't think the ports changed the AI much, so there would probably not be that much difference. Higher difficulties appear to result in robots being willing to move around more, though.

I'm pretty sure D2X-XL had something like a "patrolling" behaviour on bots in addition to normal roaming at some point. It does let you ramp the difficulty up higher than base insane with a certain option that affects the AI's aggressiveness, but I don't know how much either of those would affect roaming.