Hm Melusine... lemme try correcting you... the game wont crash if you cast a spell while you look like a troll. I have shapeshifted into troll with the cloak of the sewers and then casted innate abilities like claim upon holy might, and the game didnt crash. BUT maybe if you make a warrior that looks like a mage and try to use armor, MAYBE that will crash the game as i dont think they have a paperdoll for heavy-armored wizards.
Anyway, im not sure about this all, i would have to try with shadowkeeper.
------------------
"Let my spells do the dirty work" Ertai, High Sorceror of the Holy Flame