In addition to being a cool setting for battles, these could be an interesting way to deny OS capabilities from opposing empires. Example: The VS are fighting a massive battle on Indar, but having difficulty making progress because the NC are spamming OS's/ICBMs onto their main foothold. In response, a VS commander creates a mission that sends a unit to Ceryshen to take the NC's ICBM facility. The VS take the silo which directly results in the guys back on Indar being able to proceed with their objectives.
This would help spread out gameplay, and would add an element of global tactics to the game. Plus I want to fight in a snowy missile base ala MGS.