Keyboard shortcuts for note durations

In order to help newcomers to the application, I wonder if it might be worth adding little numbers to the right of the note entry buttons as reminders of the keystrokes.
Of course, the downside is that the keystrokes are re-programmable, but I imagine most would not do it.
Silkscreen would be a good font choice for this as it's pretty small: http://kottke.org/plus/type/silkscreen/index.html