I know your engineering is down right now... but I think this option would be helpful and straightforward.
If there was a Progressive Save button that would number files, it'd be much easier for people to save changes without going to Save As and naming a new file.
Personally, I use the following format for file names:
YYYY-MM-DD - VXX.hpt
YYYY - year
MM - month
DD - day
XX - number for that day
First one of the day is V01. Next is V02. Etc... If there was an option to define a file name structure, and have it up the revision level every time you hit that save button, this would be a great way to prevent people from over-writing their last file on accident, and would make it a lot easier to save progressive changes.