Thanks for the demo & the screencast!
I have checked your solution and yes, it works great when the user clicks into the cell and starts editing. However, I am interested in also collecting the user keypress information when the user just clicks once on the cell (ie, not in "editing" mode). I guess it could be done with $('#spreadsheet .SOME_SPREADSHEET_CELL_SELECTED_CLASS'), but I do not know the class to use? Can you help?