Unfortuantely you can't change weapon using mind control, so you have to prioritize what kind of weapons you want to use and how to access them.
In 4on4, if you are even remotely serious about it, you want to be able to access nearly all weapons separately. Example of my setup :
I have movement buttons on WASD so my weapon scripts are related to that + my mouse.
RL: press shift binds mouse1 to +rl quickfire
LG: press r binds mouse1 to +lg quickfire
GL: press space quickfire +gl
SNG/NG: press Q binds mouse1 to +nails (if i have both NG and SNG, shoot SNG only)
SG: press C to quickfire +sg AND bind mouse1 to +sg quickfire
SSG: press V to quickfire +ssg AND bind mouse1 to +ssg quickfire
So here you have a good setup where you can quickly access any weapon, for any situation

If you only play 1on1 or 2on2 basically you only need to concern yourself about RL/LG/GL, possibly a SG/SSG button for DM2, cause you might want to use none explosive weapons when you have quad.