I switch modes to get the "Up" views along with the flat views mapped to a single 8 way hat. I also use mode 3 to use the CM Eye.
Anytime you switch from one mode to another you get a host text message.
Switching between 2 modes is easy, in Mode 1, set a button to switch to mode 2. In mode 2 set the same button to switch to mode 1. In other words an alternating switch.
However, switching that, and going to mouse control, could be interesting.
I'd start by going to mode 3 and unmapping joystick axis, then see if you can remap them to mouse.
But be carefull, methodical, or you'll end up redoing your whole setup from scratch. (Good idea to save settings folder ahead of time just in case)