Ok, I actually did this work last week, but was waiting to ship the code to the client before posting the video. I recently had a qForms user ask if qForms could do selecting of a range of checkboxes—liked Google does in GMail (where you can click on a checkbox and then hold [SHIFT] and click on another checkbox to select the entire range.
Well, qForms doesn't offer this "out of the box," but it's really not that difficult to add custom hooks into the API. So, the user ask me to build an add-on library. After spending last Friday night messing around, this is what I came up with.