Not 100% sure about the former, will double check. But it's definitely true that brained monsters only pathmap to the player, not to player allies.
But the latter, I think, is just a misunderstanding.
Adders can eat any type of tarstuff (gel/tar/mud) but can only do so at a tile at which the player cannot cut it (i.e. they can eat gel at any point but can't eat tar edges or mud corners).
Edit: thanks for checking Doom.
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[Last edited by Jacob at 03-29-2012 01:25 PM]