I wouldn't mind knowing about this either, I have titanium backups which usually has an option to move things to SD and there isn't any option for the Nook.
About the question for racing games, I doubt there would be any issue as I've had all my games installed to SD on my old Evo 3D and I never noticed a degradation in game play. Perhaps slightly longer load times, but I can't say I noticed any.
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HTC One running ViperONE 3.1 RC2.
Nook HD+ on CARBON JB3