So I was talking to ZZJ and looking at some code, when I noticed something kind of funny. GPs *do* get increased range, but only when connected by tubes to a CC, and the increase is capped at 7.
Now, certain weapons like the Thor's Hammer already have a range of 7, so GPs don't get any increase there. Also, certain other weapons (Acid, EMP) can be upgraded to a range of 7, so again, GPs don't get any increased range there, at least not late in the game.
Of course, it turns out the code isn't too hard to patch to increase the cap to say, 8. In that case, tubbing a GP will always allow it to have increased range.
It also wouldn't be too hard to give an additional 2 tile range or something either, but possibly cap it sooner for longer range weapons. (Say, max of 7 or 8 still, but otherwise 2 farther than normal).