I also use my UO for most of my older cartridges (Always check for compatibility to this system, as there are some that don't follow this). I took a class from Cara Miller at My Creative Classroom, and she showed us a way of making the handbook more user friendly. We did it a little differently, by naming the rows from top to bottom A,B,C,D,E. And since there are 10 buttons in each row, the first image page became A1, then A2 for the second, on down the line until the next row, which became B1, B2, etc. Here's a picture of one of my handbooks-
All I have to do is look at the lower right hand corner, see that it is B8, go to the 2nd row under the eight and I can find my image with no fuss! The Creative Feature keys can be used in the same way once you know that F1-F3 are on the top row, and F3-F6 are on the bottom row.
Choose a system that works for you, either the alphabet or numerical button code. Write it in your handbooks during TV commercials in the evening, like I did.
I hope this helps!