Redsy all I can say is put together a proposal for the 2011 NEC.
Personally I think making allowances for 15, 20 and 30 amp circuits, (the only circuits that are in issue) would only add confusion.
I do not think it is a hardship to run a full size ground on these size circuits.
I run into this requirement often with site lighting and we may run 10, 8, 6, 4 even 2 AWG for use with 20 or 30 amp circuits we know when we do that we will be running a full sized EGC.
I will also point again that a 10 AWG is only acceptable for a 60 amp breaker if you use 6 AWG CU for the ungrounded. If you bump up the ungrounded conductors to say 2 AWG for voltage drop the EGC will need to be 6 AWG on that 60 amp circuit. (a guess, I did not do the calacs).
My point is 250.122(B) is not about sizing the EGC to the OCP but about sizing the EGC for the VD.
