Anti-Aliasing should definitively be possible in Drakensang, but in fact it doesn't quite work.
If I remember this correctly, it will be kind of omplementted with a new patch.
Some people report that renaming the .exe file in for example bioshock.exe makes the NVidia driver think it is just Bioshock and thus the driver enables Anti-Aliasing for it - with this trick you can have it in the game.
I don't know too much about it, and I think the Drakensang forum is better for finding an answer.
It's complicated.
When you find a big kettle of crazy, it's best not to stir it. --Dilbert cartoon
"Interplay.some zombiefied unlife thing going on there" - skavenhorde at RPGWatch