Now i know it doesnt say support for Max9 but it does work as i use Max9 and i use the script all the time.
Multi Objects Unwrap Script
Usage:
1- Select the objects you want to unwrap and click on 'unwrap UV's' : edit them.
2- When it's done click 'set UV's' ( don't forget ! ).

Known limitations:
- Only polys and meshes are supported (the other objects are converted to Poly or Mesh).
- instance or reference objects could not work at this time. (untested)
Options:
- work on channel : the channel UV on which the script operates.
- copied from : copy this channel as starting point (optional).
- don't use Channel Info : don't use the Channel Info interface for the copy.
- use previous unwrap: reuse the last 'Unwrap' modifier when It's possible.
- convert to polys: converts the objects to editable poly. No undo available.
Have fun and let me know if this helps anyone.


RANGERS LEAD THE WAY!!!
Do not post stupid suggestions just because you had a bad round in PR 