see: Mechwarrior
It's fairly common for players to have their missiles on a different weapon group than their sustained fire, or their HE burst damage on a different weapon group than their Kinetic sustained pressure. In order to fire a missile, you would need to switch away from your Guns group to your Missile group, then shoot missile, then switch back to Guns and keep shooting. That's three separate actions when it only needs to be one. Compare to Mechwarrior, which has keybinds for cycling between weapon groups but also keybinds for firing a group regardless of which is active; you can put all your SRMs on 3 and all your LRMs on 4 and then just push that button whenever you want to dispense missiles.
There is not currently a button to Fire Group X; you need to switch to group X then fire active group. Easiest solution would be to use Alt, Shift, or Control as a modifier. For example; pushing 5 switches to group 5, but hitting Alt-5 just fires group 5. In terms of gameplay effect, this would make it much easier to weave Sabots/Torpedoes/etc. into your normal sustained dakka without having to fuddle with controls or lay off the trigger.
