The ability to move and/or resize each individual element on the HUD interface is great for both disabled and able-bodied gamers alike. For those gamers with low stamina, strength, or dexterity, the ability to place the most essential elements where the gamer feels most comfortable is critical. Many disabled gamers position certain key elements such as hot bars in their ‘sweet spots’ to conserve energy and allow an enjoyable experience as opposed to a workout.
UI customization requires a lot of development work and is often not tackled, but many games support total customization of the UI. An interesting case is World of Warcraft, where Blizzard exposed the XML underpinnings of its interface, to allow modification of the UI with minimal developer support. Perhaps unsurprisingly, there are specific WoW mods developed just for gamers with disabilities such as colorblind and interface altering modifications. These enable critical buttons that require repeated pressing by the player to be centered in an area where the end user often leaves the mouse.
For gamers with disabilities, customization can make it easier to manage situations that need quick reaction time. The less frustrated the gamer is, the more likely they are to continue enjoying the game.
A woman with strength and stamina deficiency due to Multiple Sclerosis loves to play a strategy game, but its buttons are locked in the lower right-hand corner of the screen. This causes her to move the mouse repeatedly and quickly around the screen, between the UI and other game elements. This action is difficult for her, and often cuts her game time short. If the buttons were placed in a movable element, she could determine the easiest place for her to control the flow of the game. She’d be less tired, able to play longer, and have a more rewarding experience.