it said they have sliders on the radio that could be used for brake actuation...pretty good idea!!! I think..
Not a great idea IMHO
Lots of people do it this way.
Put brakes on a separate channel.
Mix that channel with the elevator channel and set it up so that the brakes come on with full down elevator.
Set the mix to be active ONLY when the retracts are DOWN.
Now if you have landed "HOT AND LONG" you are not fumbling for that slider. Just pulsing full down will do it.