Steering wheel buttons functions on UI - how to disable/remap

Hi all,
I've tried to find an existing thread about this but I couldn't find.
There is a way to disable (or remapping) the steering wheel buttons functions on game menu (UI)??
I have a Thrustmaster T500 and I use the "circle" button on wheel as "push-to-talk" button on Discord, and this same button is assigned as "back" function ons AMS2 UI. It's very boring when I use button to talk and the UI game goes back.
I know that I can choose another button to control push-to-talk, but I'm used to doing it that way for years with no troubles in any other sim that I've played.

 

Half of the functions in the game cannot be remapped yet, for whatever reason. It's one of the flaws which has existed since day one and still isn't resolved yet.

 

isn't it also in other sims.
Since i have a non standard wheel i cannot navigate in menues in dirt Rally too.
Some functions are hardcoded for menu navigation.
Or you have no menu navigation, like AC.