Rudder Trimmer (Special menu Option) as in-game toggle

Hi,

I was wondering if there is a way to "Rudder Trimmer" on/off feature in-game. (an in game key that toggles the option of the "Rudder Trimmer" found in the SPECIAL option)

I usually trim only collective but sometimes, like with Autopilot Heading, I wish I could trim rudder too, only for this, and after leaving autopilot heading, go back to the collective trimmer only mode.

Thanks