Something odd that I have noticed about my imp character is that despite being tiny in size, the radius at which my character gets bumped by party members or blocked by NPCs and terrain is even larger than a medium sized PC. At one point I tried and failed for about three minutes to open a door that an NPC was standing near, only to see a drow walk up and open the door on the first try without any special dancing around to get in exactly the right spot.
This behavior is odd, so I'm not sure if it's possible, but I wanted to make the suggestion that imp and pixie NPCs have this sort of "bumping" behavior turned off or tuned down at least, to reflect both the fact that they are tiny creatures and that a flying creature should have no trouble sharing space with another creature, since vertical space is open to them.
Turning off collission
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