it would be quite easy to fuse added in units using the foc system, as it doesnt tie in with the main gameplay,(unless it has special projectiles or hardpoints), Its the other things like changing the main game data that would be trickier
yes, but you shouldnt do it unless your an experienced codr.
...experienced? I don't think it is that hard to look through the xml for stuff relating to what you want and copying and pasting it >.>
true. but when i wasnt an experienced coder, id try that and it wouldnt work.