Great job. Havent playtested this patch yet, but will do soon enough.
You're right, staying in comm is important in early game but later there's nothing more to do than marking.
Not to go completely off-topic, but:
If the game is progressing towards a stalemate, I think any commander should stay in comm and try to organize their team on the field, not just solely mark and spam mark enemy siege units. There's planty of tools available as commander to change your teams performance as the game progresses, and I'm not thinking about buffing, but organization.