Yes, the Tank without any added gadgetry is awesome. However, how many of you besides USRanger have tried to make use of rockets on vehicles? It is a very cool effect, and ... hear me out.
Enabling "land mode" for rockets will not pose any advantage with any tank vs. tank battle. Heck, even if it had 160 rockets, I doubt if anyone using this feature would be anymore effective than a 5 inch gunner at hitting any specific target (ie. town buildings, hangars, etc).
It would add more realism. No reasonable commander would waste valuable rockets, tossing them blindly into the dirt without having some calculation for elevation and direction.
Plain and simple, are the rocket launchers going to be functional or eye candy?