I've been playing around in the racing mode for the past several hours.
One thing led to another, and my weak little fingers became all tired and crippled from the constant button pressing.
So I tried binding Jump, boosting and attaching to space. It worked very well for me, If not a bit problematic for some situations.
Upside was I could press and hold space to attach to a surface, and then jump off once I released it.
I could preform several actions with a single button, which made it easier on my joint issue, and made the game play smoother and more fluid for me.
The downside was that when trying to jump indoors you would instead of jumping, boost around; which rendered my binding problematic.
I was thinking that you could add an option perhaps that would disable the boosting function whilst on the ground.
Now I know boosting can be very useful when trying to dodge attacks, which is why I think it should be an option, and not a change.
Sincerely, Mr Crippled.