Sorry should have explained the mode select button.
In Mode 1, pick the button your going to use, modify it, choose function "switch to mode 2"
In mode 2 pick the same button, modify it, choose function "switch to mode 1"
So whatever mode your in when you push the button, it will switch to the other one.
I also have a base button setup exactly the same way for modes 3 & 4.
So I can get to any mode with at most 2 button presses, depending on which mode.
While not exactly the same as a 2 stage trigger (for those who are missing them)
They can be setup to be very very close to that in effect.
So in mode 1 trigger is set to fire primary only, in mode 2 its set to full guns.
You roll in behind someone, light them up with the machine guns, and when you see hits hit the mode switch and bring on the whole works.