I'm planing on making a vid about tweaking a mission from start to finish. It will have, changing points and slots, making units available, giving the extra units a spawn point, disabling AI support and maybe swapping units.
I'm not very good at giving instructions. My first and second attempt at making this vid didn't turn out. So right now, no vid. Maybe later.
Here's a update, I tried to give myself 200 of most of the German units and the game kept CTD. I then gave myself 200-300 of just my favorite units and so far so good. I also made those units "Elites" and it still works. I'm still hoping to make a vid. I started one but I screwed it up so I put in on the back burner.
I've got my German mission pretty hacked up. Lots of units, lots of "Elite" units, gave myself a few Russian units. The game is kind of unstable, it works most of the time. It's still fun for me but I thought I should post that.