Increasing your scene file's version number is something you (hopefully) do often. The built in version isn't as flexible as I'd like, so... here you go.
You can add this Python script to your shelf and then, through the magic of pushing a button, save your currently open scene to the next version.
The script follows these rules:
You can find it on Github: https://github.com/flipswitchingmonkey/fsm_vexnstuff