REQUEST: Add a button to disable all single-key shortcuts

[rubo77]

The main reason, everyone should install this addon in Thunderbird is the extreme danger in the default Single Key Shortcuts if you didn't notice, that you accidently had the focus on your inbox and start typing. This causes real havoc on your mails.

Can you please add a Button to disable or change all those single-key shortcuts with one click?

The only one, that is harmless and really useful and can stay, is

R="Toggle Read Status"

All others should be disablable with one click.

see https://bugzilla.mozilla.org/show_bug.cgi?id=615957