So basically right now we have a commander as a battle unit , with different modules suitable for different tasks. But actually we already have a lot of combat units apart from commander , whose roles it takes.
So here is my idea , just as Skasi wrote:
Commanders should be commanders. No experimental weapon platforms; no porc-busters; none of the current existant unit roles.
It should be a unique unit with the ability to turn the tide of battle with other means than sheer hp, firepower, speed or range.
I think commanders may perform that role with modules , which give BONUSES to nearby units (like strike modules which give bonus to speed and range) , battle (damage and armor) , recon (LOS and reduction in decloak radius) and econ (buildpower etc)
Commander chassis will determine which bonus modules can be installed , and there can be various types of same module. For balance they can also have drawbacks.
Modules may be "tactical" which give reasonable bonus for units around commander or "strategic" which give much smaller bonus , but to entire army.
This will make commanders different from any other mods aswell as adding lots of fun.
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