Mesh animation support is something I've worked on for a while as well. There's still many small issues to solve, but I've managed to export/import animations already. The trick is the DAT-format stores floats of animations in a lossy compression format, and finding a solid and reliable compression method (not a lousy hack job that works on specific animations only) took me a couple of weeks.
While working on export/import functionality I didn't want to launch the game every time to verify if it worked, and since I've got a modelviewer working, why not try some more goofing about
:
http://sh4.skwas.net/media/flags.avi
With mesh animations out of the way, the only trouble left is character animations (skinned vertices/bones) which are found in marine.dat. Not anytime soon though...