Yesterday I released this on ScriptSpot. Basicaly what it does is to let you attach as much animated meshes as you want without losing the animation previously applied to each one of them.
You’ll find some tutorials there and on my site that explain more extensively what it does and for what kind of situations it can be useful.
The thing is that I’ve only tested it on 3dsMax 2010-11-12 x64 and I would know if it actually works on x32 and on previous versions of Max. So please, if you try it just let me know here, on Scriptspot or directly on my mail (you’ll find it at the about button of the script).
Btw the script is open source, so you may find in the source code something useful for you.
As usual, comments and suggestions are warmly welcome