make com stronger but much more expensive and valuable: higher module costs(but also bigger effects), death explosion which deals 200% damage to allies, all units are destroyed if commander dies, and they have bigger start HP (ca. 10000) and a defonly startweapon (small range).
AND make the coms much slower if unmorphed (1st morph -> good alround combat unit(due to new weapon), normal speed and 8000 HP (can be upgraded with HP module)
max com:
50000HP, 20000HP shield, either jumpjets or personal teleport, maybe cloak, 60 BP, 800DPS at good range, heavy drones, ressurection, ...