That's a really good way too. It's super easy to simply count one, two, three, four, or five lights -- it gets harder to count as you go up BUT, no biggie, simply put the most used / most important / your gigging tones in the first four or five banks and you're good to go.
I like ice9mike's solution far better than the one I came up with ... and, I have to think it wouldn't be too difficult to code into the firmware. Maybe "someone" (what say ye ice9mike?) could suggest it on IdeaScale?