Would it be possible to make it so the reserve slider would allow you to reserve for the last item in your hands you clicked on?
So, you could have a pistol and grenade, click the grenade, and the reserve slider then has a slot for grenade throw?
Then you click the pistol and it goes back to the gun reserve slider.
When I give some poor sap a pistol, I really want him to be able to lob those grenades after he has moved around.