Recently someone posted about a friend who needs to drive with one hand, and a number of good ideas were offered to assist.
Today on redrc.net I noticed that Yeah Racing is now offering a single hand transmitter steering adaptor for those who need or choose to drive with one hand.
Thought I'd bring this up as it's worth looking into I believe.

I used to drive one handed a lot. For doing videos. Some controllers worked great for it.

There is a racer in WNY/CNY that races with only one hand. Bandit, great guy and fast too! no special setup for the radio he uses(I never looked that closely).

interesting ive only wever seen the 3d printed ones

Spektrum has a Tx with thumb steering built in.
https://www.towerhobbies.com/product...5/SPM5200.html