Well that depends... you see goblins argue all the time

That's it! I will make a super-powerful goblin marines and send them in!

Give them special rules and special missions

The beauty of this game is that, if you make the scenario, you get to decide the special rules

Indeed. With most of the games I feel some kind of a barrier when I want to make (or am just thinking about making) any changes / rule variation. I feel that it's not right to change what is original. But with DOOM. Oh man. That system is ment to be changed and adapted to you liking, ideas and group. That's great about the game.

Hows about posting some of your homemades into BGG so we can have a shot

You will have to wait for that I'm afraid. Got some other things to do atm (doing my 2nd masters degree) and looking for a new work.

But I will do that as soon as I get it finished and tested !

Let my gaming group be playtesters as well

The marines in my group never hesitates when it comes to strategy, and the invader (me) show no mercy when it comes to event cards