Onscreen keyboard shortcut support

The Sonar line has lots of support for keyboard users, but as someone who hasn't used the product enough to become automatic, I struggle to recall the many numerous keyboard shortcuts.  Here's a suggestion:
 
In its Chrome OS, Google offers a feature that allows users to open a keyboard "overlay" where each key is graphically displayed and as the option keys, i.e. CTRL, ALT, CTRL+Shift, etc., the display changes to show the functions under those conditions.  I included a screenshot to show a sample.  This includes the labels for CTRL+Shift, but it changes when different key combinations are applied.  It's very handy because it pops up over the current page and eliminates the need for a separate pdf file and provides better (more keyboard friendly) graphic arrangement.

Would it be hard for your rocket scientists to create something like this?  It's SO convenient when learning new shortcuts and I bet it would encourage more of your users to use the most productive workflow.

Wow!  That's great.  Thanks for the prompt feedback, too.  Asked and answered all in about 15 minutes!