I 
never use piano-style mode on my arranger....always split keyboard, usually at F#2, G2, or A2.  
 Getting to the fills has 
never been a problem...fast tempo, slow tempo...doesn't matter...it's second nature...I could practically do it in my sleep...hey, that might come in handy some day. 

  The Yamaha style control buttons are 
perfectly located on the S910 and Tyros...close enough to reach easily, and far enough so there are no accidents.
  The S910 has rubbery buttons that feel great and never get slippery....they should be on 
all arrangers.
  I'd no sooner use a multiple foot switch than I would use bass pedals again.
  We all have our preferences.