E-36 mobility scooter Brake issue

OK, so this e-36 E-48 etc. three wheel scooter is fast, faster than a wheelchair, BUT If you live in hill country it will try to kill you...If you have one you know exactly what I am talking about. I had mine for a few years and at one point I just wanted to give it away, and they are not cheap, so here's what I did.
        so, what I decided to do is put a temporary kill switch on the handlebars to shut off motor for coasting downhill. release the button and the automatic electric brake will stop you...if that's what you want.

  But who wants to stop, when they simply wish to not go as fast down a hill?

 well, that's what the stock E-36 does. Stop and go all the way down a steep hill, and it almost threw me over the handlebars, or at least slid my ass off the seat. STUPID design...but then again, the hand brakes can barely stop a moving scooter...at my age.

   It is not an electro brake as in a wheelchair, or I could had removed that easily, 

 again, if you could ask an engineer or technician how a person can bypass this "Auto-Brake" system and yes, violate their warantee, I would appreciate it,

I am sure with a little effort you could find me an answer. I'm thinking a wire in the throttle? a different hand throttle? so off doesn't mean brake.