My mistake, in reading your report I got the impression the 1-2 degree sense of direction allowance was yours. What I would really like to read at this point is the report that established these limits. You wouldn't happen to have a link would you?
I still feel, from my experiences with the aircraft, is that the biggest threat in a sideslip in the R22 is overcontrolling by the pilot. The limit being there to prevent inexperienced pilots from getting into trouble.
Also, can you please explain how the coning hinges prevent a 90 degree lead but allow a 72 degree lead??