Why not give a hot key for the onion option: [loop through tag frames]?

I think this function is very useful and high rate to use
especially when I draw character action sprites which divided by difference tags
but without hot key, I need to click 2 times to active this function and click 2 more times to off it when I finished my first frame in this tag.

I do a lot of search and be sure that there are no hot key for this.
so post this and eager to get this feature in future

Thank you!