For some motor impaired gamers, the requirements to press multiple buttons simultaneously can be a significant barrier. For example, pressing two buttons together to execute a throw in a fighting game.
A solution is to allow more than one action to be assigned to a single physical button. For example, console level remap allowing players to assign pressing A to instead register A and X simultaneously.
This gamer is normally unable to execute those kind of complex moves, but has been enabled through flexible remapping:
Next: Controller assist