By definition - wouldn't editing someone elses work mean changing the polygons, texture or anything that is well, actually his work?
By removing a rotation animation and nod am I really effectively modifying his work or just making it suitable for use as a doodad? o.0
I'll ask I guess, but I keep reading mixed views on the whole model-editing thing, people saying that removing weapons, re-sizing and stuff like this isn't really editing and would bother the modeller to be spammed with "can I edit this" requests?