Well, you could potentially save learning up to 37 keys out of 85 total, but there's three things that could negate the time savings somewhat: finding the correct code; having to potentially delete "longer" preset labels before inputting your own; and having to potentially "hide" unused preset keys if the database ends up using more LCD buttons than your device requires.

My final strategy would invove a combination of database codes and learned codes anyways, especially for devices such as my Marantz receiver which (due to toggle bits) has always responded better to URC's database codes.

Also it takes a VERY LONG TIME to completely label/learn all of the LCD keys by scratch, so I really wouldn't recommend doing this unless you absolutely must have everything in a specific place - whether you start off using the database or not.

I actually came up with an Excel planner that helps you plan out LCD button positions and labels if anyone is interested.