I know this is going to sound stupid, but I always found the fact that FMC competitors are given a written scramble AT ALL to be somewhat impure.
Why not just give them a single scrambled cube, as in all the other events?
Make them match-the-scramble to find a "scramble" for the cube. Then they can use that as their "scramble" and even do NISS, etc.
I understand that would drastically (negatively) affect the way FMCers find solutions and waste a minute or two (from the arbitrary 1-hour limit), but it would certainly avoid this entire debate and would standardize the regulations.