I remember from playing when it was first release that while possessing a creature you could walk up to a trap and repeatedly press NUM0 to destroy it. I tried it on the first cannon i found playing the GOG version (with a troll and dark elf) and nothing happened, i re-binded the diarm key and still nothing.

I never had the patch playing it in the day so it could be related to that (it seems likely that a patch may have limited it to certain creatures) but even if that's the case i'm not sure why it wouldnt work with a troll.

Has anyone had it working/know the problem?

that feature was broken by the 1.7 patch, same with unlocking doors and recruiting black knights on the later levels