One more thing: unless it was removed, you can "turn off" the jump drive on a ship, making it act like a normal ship in the TG. So if you have a TG that consists of two identical jump ships, each with a squadron size of two or greater, you could turn off the jump drive on one of them and have them jump as a single TG (using the other one's drive).
Note that I haven't tried anything like this for MANY years, so like I said this ability may have been ripped out of the code at some point.
John