Different types of videogames could benefit from different types of physical controls. For example, a dial to zoom in with a rifle scope:
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Or a spring-loaded switch for notching and firing an arrow, or shooting a pool cue:
To combine controls like these with the standard D-pad controller, the designer(s) behind Suosi Design came up with this innovative Mozer Gamepad concept:
It’s a great idea, and surely one of the bigger players in the space has thought of it as well. The fact that we haven’t seen this suggests it’s technically difficult to pull off.
They’ve got a few more concepts up here.
Source: core77