norb
You can create a mapkey to purge your data.
Under Tools-->Mapkeys, create a new mapkey. There is a tab in the Dialog box that says OS Script. Go into that tab and write
purge
as the script.
Save the mapkey to your startup config.pro, and finally, use Tools-->Customize Screen to create the toolbar icon. Mapkeys are way at the bottom of the "Categories" menu. You can add it to the Tools menu by dragging the mapkey into the menu.
When you press this button, it will purge your working directory.
A final caveat: This mapkey will NOT prompt you to purge your folder so make sure that everything is as you want it to be before you get rid of all those old versions. MY purge button is in a Flyout menu, so I have to think about what I am doing before I actually do the purging.
All the best,
-Mark