Gary, we differ greatly in opinion here. I will most likely never buy another arranger without a touch screen. It is so fast, versatile and easy to use. Very large icons. . . just touch and go! There are still plenty of sliders and buttons!
As far as pedals, I use the dedicated Ketron 6-switch pedal. (There is also a 13-switch pedal.) I assign vocal harmony on/off to #1, text scroll up and down to 2 and 3, sustain to 4 and 5 (I have very big feet with no feeling in them and don't want to have to look at the switches, and break/fill to 6.
On some songs when I need different things I use different pedal settings. Bank of settings can be stored in Registration, so you can have several available for your own needs. You can assign each variation change/start/stop/fill, reg up and down, PDF scroll, Bassist settings, effects changes, voice up or down. . . just about any function that the keyboard has available.
I don't have to carry an extra sustain and assignable pedal with me now, although I have them if needed. I haven't used a volume pedal in a long time, but there is a place for that too.
There are dozens of functions that are assignable to the foot switch. I'll bet even you could find a use for some of them.
If I want I can have the 6 switch plus dedicated volume, sustain or assignable fs!