The excessive drag from the radar array on night fighters, coupled with the back seat (which meant removing some of the fuel storage) I believe night fighters took off with 2 drop tanks mandatory. I don't know of any daytime fighters using them, though.
As far as I know, however, there was almost no difference between the 1 and the 2 models. I mean the "bomber" version had the racks under the nose to carry bombs, and removed 2 30mm guns, but other than that there wasn't much.
If HTC wanted they could add a weapons option in the hangar on the existing model we have without much problem.
P.S. The rockets were purely air to air, were very effective when used against bomber formations, and were NOT ground attack rockets. Just an FYI.