Suggestion: Auto switching from Controller <> Keyboard

Hi dev team,
Would it be possible to add a feature to auto switch between keyboard and controller automatically when in-game instead of locking in the option only when I login.

Similiar to how D3 and D4 (and I think D2 reborn) does this - if I click a controller button, mouse or keyboard the interface will change appropriately.

The main reason is I like to use a controller to play but there are some things - like manipulating stash or scrolling through and comparing items or games where keyboard and mouse are just more efficient.

Thanks.