Bleh, the GM-1 boost wouldn't be too fun to be fitted to our current G6. Maybe a separate G6/AS would be nice, but having the GM-1 would add unnecessary weight to the current G6.
We also can't really have it as an optional fit in the hangar if that's what you're thinking. It's pretty random... it's an internal accessory not really a weapons/ord/fuel accessory.
Most of the fights are down low anyway, so I don't like the idea of adding GM-1 as a standard to the G6.