In case anyone is interested... I have written a small protocol dumper and serial passthrough for Multiwii. I put an Arduino on the aircraft with an Xbee, connected to the second serial port of the MultiWii. I then run the GUI into a USB explorer with another XBee on it. This gives me in the air tuning ability, and also produces dumps like this (if a USB cabel is connected):
-->> PID
-->> RC_TUNING
-->> IDENT
-->> BOX
-->> BOXNAMES
-->> MISC
-->> PID
-->> RC_TUNING
<<-- PID 28 1E 17 28 1E 17 55 2D 0 77 11 9 B 0 0 14 8 2D E 14 50 5A A 64 28 0 0 0 0 0
-->> IDENT
-->> BOX
-->> BOXNAMES
<<-- RC_TUNING 5A 41 0 0 0 A 32
-->> MISC
-->> PID
<<-- IDENT E6 3 0 0 0 0 0
-->> RC_TUNING
-->> IDENT