Didn't think about the clean exit.  I agree that would make things more cumbersome, but for me at least if I set it up so the menu loaded on bootup it wouldn't be so bad.

As for someone doing the dirtywork, that wouldn't be necessary unless the developer wanted it that way.  With mamewah I do my own screenshots.  Many just grabbed from a google image search.  Not sure why manuals would be needed though.  

I was just invisioning something where you put files with a .lnk (or some) extension on them in a specified folder (maybe called games).  Those files are just text files with one line in them.  That being the path to the executable to run for a specific game.  Than just have a snaps folder with an image file that is the screenshot.  The name of that screenshot file matches the name of the lnk file in the games folder.  That way the launcher frontend can automatically find new titles just by the user creating the lnk file and placing it in the games folder, and throwing a screen shot in the snaps folder.  They could even skip the screenshot if they wanted.

I may take a stab and writing this as I realize it may only be useful to me.  I do appreciate the feedback.