I added this to the custom keybind to the DCS World OpenBeta\Mods\aircraft\F14\Input\F-14B-Pilot\keyboard\default.lua file that others might find usefull.
----------------------------------------------------------------------------------------------------------
{down = device_commands.WEAP_Master_Arm_Cover, up = device_commands.WEAP_Master_Arm_Cover, value_down = 0, value_up = 1, cockpit_device_id=devices.WEAPONS, name = _('Master Arm Safe and Cover Closed, else Cover Open'), category = _('ACM Panel')},
----------------------------------------------------------------------------------------------------------
What this achieves is if the switch is on then the master cover is closed and if the button is not on then the master switch cover is open without the master arm being on.
Use case. I have a momentary switch with a cover on it (virpil mongoose throttle), when the cover is closed it activates the down position on the momentary switch closing the cover in dcs. When I flip the cover open the switch returns to the neutral (off) position and the cover in DCS opens without activating master arm which then requires me to press up on the switch to activate master arm.
I would request that this keybind be added by default in a future update.
Thanks - Nomad