Is DarkPlaces or FTE capable of decent rotating doors in the Quake 1 map format?
I always liked the rotating doors in Half-Life, the func_rotate_doors made available in hipnotic aren't really that good and require a lot of entities on the map side and the end result doesn't feel very authentic.
[In the quake engine source, there is some "#ifdef Quake2" code in the physics that seem to imply there might be way to do a modified build with better rotating doors but it would probably take me a while to figure out all the pieces of even trying it (the map, the QuakeC, the engine).]