Per-node Progress Bar
If you add a ratio into the text box of a node, possibly preceded by an indicator (eg. "% 13/42"), a green progress bar fills up to that percentage of total width of the text-box appearing as its background... should be simple to do with js/jq using something like box-shadow insets...
var progress = parseFloat($(mapjs-node-textbox-entry));
$("#mapjs-node-textbox-container").css("box-shadow", "inset "+(progress * mapjs-node.css("width") )+"px 0px 0px 0px #8AC007");
User can then update the progress bar by simple key-in of new ratio and it will update the progress bar on the fly. I think this would be a beneficial visual aid for tracking progress on tasks/book-chapters/etc (user could specify numbering of specific tasks in an attachment).