I was going to say. I bet a lot of drivers of HST tractors with the brakes on the same side as the HST lever never bother to even try (myself included) because it would require some contortion of the feet to accomplish it. And even if you were using cruise control, as soon as you hit the brakes, it pops off. So I don't see how you could really manage it, unless you put both feet on the same side, which would just be silly. Rule number one of tractoring is always look cool doing it.
On our Kubota, the cruise control only kicks off when you apply both brakes and the manual at least on the 5030 indicated to use the cruise control in order to use the turning brakes. I rarely use turning brakes on our Kubota HST as the turning radius is very sharp and doing so really helps little for the amount it helps with Industrial tires. I took our new
L5740 out out into an open field yesterday just to see if it was any different than our previous
L5030 and the results were pretty much the same, not worth the effort to use on a regular basis.
The M8540 with Ag tires reacts better to split brake steering and my son uses them often working in the woods. I mostly use it pulling a pull type rotary cutter where tight turns will just break stuff.
I grew up farming where using split brakes was necessary to make the quick, short turns at the end of the row, also used them to keep from getting stuck, maneuver through tight sections in the woods etc.
Utility of steering brakes in turns will vary from one tractor to the other as we have had some that due to tire type, wheelbase or whatever, all that happened was you just tore the ground up, so we didn't bother with them.
I would recommend anyone who hasn't tried it on their tractor to see if it helps or not and go from there.