Adriann asked me today: "Do you think it would be at all possible to implement an in-game weapon customization system [in Modern Warfare 2]?" He would like to be able to change weapon options on-the-fly, rather than being limited to a handful of saved loadouts - like in the first Modern Warfare. It's not that the loadouts are a problem. It's that sometimes you want to make minor adjustments, like adding a silencer or switching to smoke grenades.
I think many games could learn from this screen in Frontlines: Fuel of War:
As you can see, two different option sets are included on one screen. The player can quickly and easily move between Loadout, Role or Deployment location by merely flicking the 360 thumbstick left or right. Then pushing the thumbstick down or up changes the player's selection within a set of options.
The player doesn't have to make a selection in one set of choices before having access to another set. The options are not tiered. They are displayed simultaneously. So a player can quickly change one without making a selection in another.
It's a very streamlined interface... worth copying.