Just a few ideas for the Standalone game! Hand slots. Basically (in real life) some items are too large to fit in your backpack; like the big jerry can, so these would need to be carried in one hand, limiting your weapons usage to one handed weapons i.e. pistols/hatchets. This also opens up the idea that you could carry extra bags for those big hauls, like a dufflebag full of car parts, weapons or medical supplies Use of belts that have extra 'active' slots. So you have your primary and secondary weapons, occupied by a rifle and a bat, with the belt slot you can have a pistol tucked down the back (or front if you're the daring sort) that can pulled out on a moments notice. Or a flash-light, tools, knife etc. Belts would come in regular, tool and holster flavours! I can't say, in terms of immersion/realism, that I'm fond of a minecraft style hotkey bar. Though I'm not sure if that's limited to items, not weapons. Anything you can pick up can be used as a melee weapon and/or thrown. (Read in Brian Blessed's voice) No bullets in your rifle? Use the stock of the rifle to smash their faces into a bloody mush. All you have is a flash-light? Break it over their skulls in glorious fervour! Reflect on the usefulness of cinder-blocks and other useless bits as they hurtle their way towards your foe. Some weapons can be 'concealed'. In the case of the aforementioned “belt” slot; you could hide certain weapons, giving you an edge against the muggings and deception that the wasteland has seen. :D