Tahts exactly what I did about 6 months ago. "/path/file.js?varsion=timestamp" where timestamp is:

A) The last modified time of the file in milliseconds B) The current time milliseconds if in debug mode

Depending on if debug mode is turned on the minified file or original is served to the client. I minify on-demand since it's so fast and files rarely change, only the first request takes the hit and it is not a big hit, maybe 1 or 2 seconds.

I serve the pages with a 1 yr expiration time for these files.

I do the same for CSS.

It works very nicely :) NEVER have to clear a browser's cache when developing and garantee that all users always have the latest code.