You don't need to edit anything, since it is already set up to store presets. The presets just happen to be preloaded with "traditional" settings, not rock/blues settings. When you figure out that Whiter Shade "might be" 68 8600 000 on, soft, slow, second, just chose a location and hit store.
But you find out the artists were just grabbing a lot of drawbars, and even if you knew exactly what they set, recreating the old analog sound from a manhandled B3 and leslie is difficult with our new digital toys. This was the entire purpose of the original TW manager -- make it simpler to just grab some RD-2000 TW drawbars, and save the interesting settings you found.
Regardless, I am still working an update to add more rock/jazz/blues presets.