In this map.ini and test map the tank general's emperor overlord tanks come with all upgrades including bunker, and can fire smoke grenades that make enemies stop attacking them as long as they stay near the smoke.

The smoke grenades are launched using the switch to real buildings button in the tank commandset.
It buys the upgrade that triggers the OCL of the grenades. When the grenades die the upgrade is removed so you can buy it again and launch new grenades.

The grenades fire a status weapon that affects allies and makes them has status MASKED, which means they cannot be targeted. The status weapon has a damage radius of 100 so the tank must stay within this radius to stay masked by the smoke.

In a full mod you can make a weapon launch the grenades in a set pattern (like scud storm or commanche rocket pods) and give them explosion sounds. This is just a proof of concept map.ini.
  AllOverlordUpdrages.zip (23kb) downloaded 39 time(s).