Question: check and set key/value for more then one kv. Possible?

[Allroads]

We have a traffic_sign C12

Because this sign works from one side. Their could be no sign on the other side.
Other side, it is possible to enter and turn on road or visit a house/field. And go back.
The way must set to forward or backward on a small section. Where you do not turn anymore.

For the traffic_sign, mofa, moped and motor_vehicle

Can this be done with one checkbox? forward or backward.

And not with multiple checkboxes.

			<item name="C12 " icon="traffic_signs/NL/NL_C12.png" type="node,way">
				<key key="traffic_sign"value="NL:C12" />
				<key key="motor_vehicle" value="no" />
				<key key="mofa" value="yes" />
				<key key="moped" value="yes" />

				<space />
				<check key="traffic_sign:forward" text="Forward motor_vehicle" default="off" value_off="" value_on="NL:C12" />
				<check key="traffic_sign:backward" text="Backward motor_vehicle" default="off" value_off="" value_on="NL:C12" />					
				<check key="motor_vehicle:forward" text="Forward motor_vehicle" default="off" value_off="" value_on="no" />
				<check key="motor_vehicle:backward" text="Backward motor_vehicle" default="off" value_off="" value_on="no" />
				<check key="mofa:forward" text="Forward motor_vehicle" default="off" value_off="" value_on="yes" />
				<check key="mofa:backward" text="Backward motor_vehicle" default="off" value_off="" value_on="yes" />
				<check key="moped:forward" text="Forward motor_vehicle" default="off" value_off="" value_on="yes" />
				<check key="moped:backward" text="Backward motor_vehicle" default="off" value_off="" value_on="yes" />
			</item>