#1
ok, i'm thinking of changing string gauge from 10s to 9.5s. the guitar is question is a schecter blackjack atx fr

i know it's only half a gauge, but will the floyd rose make life difficult?
#2
Well, not too difficult, but spring tension adjustment will be necessary.
Gear:

Guitars: Ibanez SV5470F, Ibanez Xpt700, Fender MIM Standard Stratocaster ('04-'05), Jackson Ps-2
Ashton AG200,
Amps: ENGL E530, Bugera 6262-212,
FX: TC Electronics G-major 2, Behringer EQ700, Morley Volume / Wah