Consider this answer as an illustration of how awkward the rectangular
<kbd>-tagged keys look as console controller button:
And compare with this mockup of controller button images:
Each button image could be added to the site's sprite sheet, which has a ton of unused space. Special "insert controller button" menu could be added to post editing bar. They could have a syntax like
Other SE sites have their own special features, why not add this handy thing for Arqade?