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MULTI ParcFerme="3" //0=off, 1=no setup changes allowed between qual and race except for 'Free Settings'), 2=same unless rain, 3=use RFM default 'ParcFerme=<0-2>'
Change it to ="1" This will allow you to either set the number of adjustments that can be made with the exception of the grille tape.
To totally disable it change it ="0"
MULTI FreeSettings="-1" // -1=use RFM/season/GDB default, or add to allow minor changes with fixed/parc ferme setups: 1=steering lock, 2=brake pressure, 4=starting fuel, 8=fuel strategy 16=tire compound, 32=brake bias, 64=front wing, 128=engine settings
Change to what ever number you wish to allow for changing an example would be steering lock(1)+break pressure(2)+break bias(32)
So your MULTI FreeSettings would = 35
hope this helps some understand it a bit more