Lol, I can't believe this thread is still going strong. You only have to think for a moment how DB Proffesional works, to realize bones are an option, not a must. All fps creator is doing is reading in the fpe file, and using that to work out what code to run. As animations in DB Pro work with both bones and linked rotation animations, both will work. All DB does is play an animation from frame a to frame b.
For animating characters, bones are the best method, but for doors, draws and other basic move or rotate anims it is just as easy, in fact easier, not to use any bones at all. For example make a rectangle door shape, move the pivot point to one side of the door and make an anim rotating it on the y axis. Faster than adding bones, skinning etc. The very name bones, implies you use it on something that actually needs a skeleton. So a human, or a machine, but not a simple door. Really depends on what you need in the end.
http://s6.bitefight.org/c.php?uid=103081