You can do the PerformMoveAction_Custom with a set of parameters that you want. Then when the move action is done (inline with the character movement, so not right at the time of calling it), it will call Event On Custom Move Action Performed so that you can perform your custom logic based on the inputs.
If you know statically what you want the crouch to do, then I wouldn’t use any parameters for the custom move action in order to keep network bandwidth optimized.