I am wondering how much effort would be required to implement fetaure like this:
Next to RCx_OPTION add 3 more params RCx_OPTION_HIGH, RCx_OPTION_MID, RCx_OPTION_LOW as many of RC options are just ON/OFF type those could be assigned to particular RC channel state to allow better usage of 3-position switches and RC channels utilization as well.
i.e. mount poi lock for HIGH and mount pitch/roll lock for LOW state and MID set to none.