MASTER QUICK CONTROL disables THE ENTIRE PACK, except for Hair Triggers.  You should disable it while accessing your console's store, settings, and the in-game menu.
WHILE HOLDING TOUCHPAD / VIEW, HOLD OR UNTIL YOU FEEL A RUMBLE.  Switch back to the appropriate profile for your current weapon when you want to reactivate your MODS.  See the WEAPON PROFILES section for more for information.