Hi @nurjan14,
To respond directly:
No, that’s not currently possible with ArduSub. It does seem useful, so I’ve raised an issue for it that can be tracked for any progress. You’re of course welcome to submit a pull request to add the functionality if you implement it yourself 
Additional control axes are also not currently supported in ArduSub and also not in QGroundControl, although that is something we’re planning to support in future.
This thread may be worth a read for understanding more about complex surface-controller setups