Idea for Custom Games (Fill With Bots)

I haven't SEEN this suggested before, so I'll assume it isn't discussed very much. What about a button that fills every empty position with a bot of your choice of difficulty?

It's a simple idea, yeah, but I go into customs quite a lot to test out new champions and it gets a bit tired to click "Add bot" 9 times, then make them all Intermediate since Beginner is the default. Just a quick suggestion I thought would save some people some time.