Dialogs should use mneumonics (underlined letter key shortcuts) for the footer buttons

[fuguesoft]

It'd be cool to have the first letters of various button labels activate said button label (e.g. [d]iscard, [s]ave, [c]ancel).

For example, if I ctrl w to close a document, I can then just hit d to discard the file. This instead of moving my mouse or tab focus to the Discard button and clicking/hitting return.

[Keavon]

These are called mnemonics: https://en.wikipedia.org/wiki/Mnemonics_(keyboard)

We won't use them for menu lists, but I'm open to using them for the footer buttons in dialogs in addition to Enter applying to the emphasized button.