Sounds like you're after the auto FP setting on flash sync speed. After a quick google it seems to be custom setting E1. You'll probably have it set at 1/200 and there should be the option above it for 1/200 (Auto FP) and possibly a faster one maybe 1/250(Auto FP). It basically means that 1/200 will be the fastest speed useable under normal flash scenarios,
but will enable high speed sync if you push the shutter speed faster 
(providing you're using a compatible flash, which it seems the SB-R1 is)
I don't have this camera but it seems to have been the same across varying Nikon bodies I've used