Add an option under Tools > Options > Files that resets the "automatically save after X minutes" counter when you save a file.
Sometimes I work on small files with minor changes between files. I may have just finished working on a file, then update it to reflect some new changes and before I'm able to re-save it under a different filename, TXC already overwrites it.
Such a feature would probably require a timer associated with each open file. Not sure...