Some interesting modding questions

Well I recently got this game. I was very impressed by it.I had done some done some editing with other games as well done some editing with this game. I was wondering on some of limits of modding this game as I was thinking about doing some modding for this game as well thinking about trying to do an stargate conversion.

1 Is it possible to modify (add, remove) different cargo types advailable? For example I attacked a transport ship and it spit some cargo could it spit out something totaly new like staff cannon from stargate sg-1.Also when I went back to base would be able to save it so if I loaded the savegame file up would it show I got it?

2 I noticed in the download page in the weapons section it looked as the weapons listed for download replaced existing weapons. It is possible to make new weapons? If so is the reason for having them replace existing weapons was for single player such as missions. If so I had some interesting thoughts on that. Before finding this site I was manually editing savegame files mostly changing inventory amounts of stuff. Today I found savegame editor on this site. Pretty nice.I noticed it could alter trades. I imagine the major reason for having weapons replace existing weapons it because in single player missions you could not get it. Would it be possible to edit the savegame file so that it I could trade something to get a new weapon?