The Black Shark 3 rotor brake has two issues when bound to axis:
1) Its operating behavior is physically upside-down: when the rotor brake is visibly in the up position it registers as disengaged and when it's visibly down it registers as engaged.
2) When cold starting with "Synchronize Cockpit Controls with HOTAS Controls at Mission Start" enabled in the Misc. options, if the rotor brake starts in the up position (i.e. the disengaged position when bound to axis), it is not registered as disengaged. You must move the brake handle down then back up again to register as disengaged.
I first reported these issues in April on the bug reporting section of the ED discord. Hoping I get more traction here, as I absolutely love this module and these issues have really bugged me (no pun intended). Thank you!