Thanks for the explanations on the various Kubota pedal offerings.
I bet you are right about the use of the rocker like you describe above for many people, BUT. I also think you are misunderstanding the opposition that many people have to a treadle pedal in the first place.
Even if you don't put your whole foot on top of it and try to rock back and forth, they still suck (in my opinion). Because you can't really just rest your heel on the floor and try to go forward. You do have to hover your foot above the forward arrow/pedal and use some toe pressure to get it pressed down, and thats what blows. After a couple hours of loader work, or anything really, your leg is sore and tire. And each time you want reverse, you have to pick your whole leg up in the air, and reposition it further back on the deck to hit the reverse pedal. It's fatiguing, and pointless effort.
A conventional two-pedal hydro lets you just keep your heel on the floor and use the whole weight of your leg to easily apply forward pressure, it's much less fatiguing and requires less concentration and awareness. Just like true temper's thread shows, converting to pedals up front lets you keep your heel on the floor and it's a vast improvement for most people. Hard to understand why Kubota is staying with this setup.