I been playing commander for a while and with all the people I played with. Having a mic is the most important thing there is. Youre almost like the eyes and ears of the battlefield. You can sit in the back and spot out for enemy units foot/tanks and tell everyone else. Not only you can mark targets for arty strike but SL can too.
Most of the time people always yelling keep the recon up when its ready.
If you look on the maps there always more then 1 radio. SO of course you can fight your ways to the front lines and mark targets there for arty strike

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As for force respawn use it at your liking but it seems to best use it when your force is attacking an area and is low on men. Thats when you want to use it for backup. Other then that use it if the timer for respawn is really high like 15 seconds left and a lot of people 7-8+ are in queue to respawn helps.
From what I seen so far:
Have a Mic
Spot Targets
Order Squads
Recon RECON recon
Arty Strike
Force Respawn