In fact it does have the power to hold 92 additional presets from the ones with the button combination 
You just have to use MIDI to save and recall them. Check out this part of the manual, and also I did a thread on the matter of sorting out presets for live performances.
I don’t believe there would be way to have more without midi, because of hardware limitations. There’s only so much button combination you can get, and they obviously chose to bet on flexibility of functions (and I’m glad they did)