Main button in any morebits window should be triggerable with an accesskey hotkey

[NovemLinguae]

accesskey="[letterGoesHere]" tells the browser to use its normal hotkey combination to make that a hotkey. For example, in Chrome, accesskey="s" will make Alt+Shift+S and Alt+S the hotkey. The exact control keys vary based on browser.

• Which letter should we use? Hmm. One ideas is to use "s", because this is the normal hotkey to "do the main action" in MediaWiki, such as submitting an edit. Users such as myself have muscle memory for this hotkey combination.But we'd have to be careful of situations where the edit page is open and MediaWiki is listening for this accesskey. So we'd either want to disable this accesskey on the edit page, or choose a different accesskey. Hmm. Any ideas?
• Edge case: Are there ever situations where Morebits has more than one button in the bottom left? Would need to make some decisions about the hotkey logic for that situation.

[siddharthvp]

S as the hotkey makes sense.

As for the edge case, I don't think it's a concern as an HTML form only has one submit element (which Morebits implements as a button). Even if there are multiple buttons, only one would be the primary submit button.