After 10 years of requesting this feature, I've lost hope it's going to happen with either the S910's successor or even the Tyros 4's successor. That said, I'd sure love to be proven wrong.

Irregardless, the ability to easily save a given MusicFinder record setting to REG (1-8) makes for quick set up of custom song regs, supporting whatever custom settings you desire (transpose, split point, voice selections, etc). All and all, I remain very satisifed with my Tyros 4 and appreciate the many improvements (both sound & features) over Tyros 2 and 3.