Hi Mutt,
I assume that you are talking about obstacle clearance & performance. Yes, in that case ATC don't have a clue what's going down anyway - and the acceleration altitude/FFRA/waddayawannacallit is corrected as well.
Depending on how high your min. acceleration alt. (AA) is, you might wanna apply the correction earlier than 0 deg. C - if you talk 1000 ft. AA, ISA -10 deg. gives a correction of 40 ft. - and with a generous 35/50 ft. obst. claerance to take from...
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