1. I think there is small bug in this plugin. First time, when you add this widget and write title with content, it does not save data. After page refresh it works.
2. It is imposible to add link like /?something=1&something=1 If in url is ? you can't save data. I found a solution. On line 64 in file ritch-text-widget.js you need to replace var content = textarea.val(); with var content = encodeURIComponent(textarea.val());