Meshes in a waypoint file? My, my... those devs!
Two more things, one major and one small. Tried editing file:
../Submarine/Common/Rooms/Waypoints_Room_QR2.gr2
1. Added a new bone to the parent Waypoints_Room_QR2
2. New bone (name SQ_BED05): 'has position data, no rotation data, no shear data'
3. Bone position is: -0.097114 -0.018419 -0.042244
4. Copied LOD Error value of 1.330672 from other bones
5. Closed bone editor
6. Tried to save, had exception: ArtToolInfo_ExtendedData: Exception while writing extended data Exception is [my rough translation from RU locale] there is no pointer to the object in this object instance
Second minor issue: when editing position data (double clicking in the bone viewer) when trying to enter leading '-' for a negative value gives 'invalid entry. Try again.' though the '-' still appears no problem, the same goes for pressing backspace trying to delete it. This doesn't happen in the bone creation dialog.
Can we get a bone delete and copy functions any soon?
TDW, that's an incredible tool you've made! I just couldn't believe that I am adding a complete new bone with two simple clicks, felt like a complete rocket sience, wow!

I even felt somehow relieved when it threw an exception at me.

You're the man!