I forgot to add that I'd also changed the front calipers on the SPS for the 4 pad ones - they are awesome.
I can only hope that the R is as good as the SPS was.
The 19/18 route is probably best for general road and track use anyway (IMHO).
I think you're right about the amount of lever movement required, but we are only talking about a few mm's!!! You'll not be squashing your fingers against the throttle with either setup!!
Whichever setup you have, stopping will not be a problem, maybe you'll need to start looking at more on the "go" side of things???
Don't forget about the brakelight side of things too. You'll need to ensure that provision is made for a brake switch in the setup.
Tim