As a DM, I've always kept an excel spreadsheet or on a notebook with the PCs most relevant skills and stats, to allow me to roll secret rolls, like for example a perception check to see if they spot a goblin hiding waiting to ambush them, without them knowing so if it fails they don't get suspicious. It would be cool to see a tool such as this on the Journal Tab, that either pulls info from the character sheets or can have info manually typed in with default dmroll buttons. Something simple to view at a quick glance without too much detail. Maybe its been suggested before. Cheers!