The ability to swap the pistol and grenades. I am many others I know prefer a chest-mounted pistol and hip area grenades, and it would generally be a lot more comfortable for a lot of people. Also, the ability to hold both firearms at one time. I would like this as me and several other people encounter issues when running out of ammo while in a firefight: you need to drop your primary before you can keep returning fire. It would help out a lot.