Adding 3d characters to AGS would be quite easy, few days work maybe, but that would look even worse than prerendering. Tacking on 3d to a 2d game engine will never work well. Wintermute does this and it looks awful. If you're thinking Grim Fandango style, well that's just not how it works. Grim's logic is all 3d, just happens to have 2d backdrops.
I promise to have my 3d adventure game engine ready by... the end of the year, I have a 2d (vehicle physics action pretty) game I'm urgently making before then. (offer of programming support for 3d adventures is always there, we shook on it, Rusalka!).
