If the operating system design will limit the S80 to only six control sets, then perhaps new, multiple sources and destinations could be created. For example, Mod Wheel and Aftertouch could be combined as a single control source, which could then be assigned to LFO Depth. Alternately, Mod Wheel could be assigned to control both LFO Speed and LFO Depth as a single destination. A quick glance at the S80 Data List shows that Mod Wheel is most often tied to LFO functions. The triangle wave is very good, but a sine wave is practically the bread and butter for controller effects such as panning and pitch modulation.
Patch documentation is inconsistent with patch selection.
This is fairly minor, but frustrating particularly to the new user. The S80 voice data list numbers patch 1 through 128. In reality, I just skip around until I find the patch, but this is really unnecessary. I would much prefer this. There are other places this would be very helpful, most notably in waveform selection.