I have just this minute uploaded a new tool to the vault (WHAT!?! Another one? Don't panic just read on... '> ). It is called RotateEm. It works on just a single model file at a time. All it does is to rotate the model in one of three axis, by one of two fixed angles - either 90 degrees or 180 degrees. Furthermore when rotating by 90 degrees there is the choice to rotate either clockwise or anti-clockwise. This latter option is not available for the 180 degree rotation as both directions would give the same result. This gives a total of 9 rotations.
As not all models/parts of models are centred around the origin (0,0,0) there is an option to adjust the height of the resulting model.
The project page for this is here.
Little back-story - I made this for myself because I had a need for such a tool. In fact I had made a version of this before I made and uploaded the tool in the thread at the end of this link, I just hadn't fully debugged RotateEm. I then finished making those eyes and at last got (hopefully) the bugs out of RotateEm, made slight adjustments to the 7 seven page manual packaged it and posted it.
If you download it, I would appreciate feedback especially on the manual.
Ooops, nearly forgot. Thanks to MD for his help and insight.
TR