So much conflicting information; which brands/models of sustain pedals can do full range of midi? I know the Yamaha FC-3 can, but what others? M-Audio? Roland? Behringer?
Can I assume that any pedal that has a TRS connector is full or at least half damper?

I can't really answer your question, but I can offer a few clues:

1)  I have a Roland console (KR7) - it generates the full range from zero to 127.

2)  I've DL'd literally hundreds of piano midis from many sites; very few have the full range of midi values (0 to 127), a few have half-pedaling (0, 64, 127), but probably the majority have two values (0 and 127 - this would be OFF and ON respectively).  My midi editor displays all midi controls and their values.

3)  As to which models generate which values, I have no idea as the editor doesn't say which DP generated the MIDI.

Glenn