I was using the on-the-fly file extension filter today and thought it would be nice to be able to load extension filters from File Groups. I was initially thinking there may be some need to save the extension groups on the fly but I really don't see a recurring need unless maybe it might lend itself to someone else's usability. Being able to just specify a File Group to make a quick extension filter would be pretty cool.
So instead of ticking off all these:
I could just type in movies and have it expand to the above. I was thinking that it would be nice to add the File Groups to the drop-down but there are so many that it would be overwhelming without a way to limit the File Groups that would actually display. I'd be happy with being able to just type the File Group into the extension field with or without validation although a pre-fill as you type with tab completion would be a real nice way to find what you're after in case it's an obscure File Group.
For someone that's not as well versed in the good old DOS days as a lot of us that have grown up with an understanding of extensions and what's what it would probably be easier to use.