Website functionality: Shift-click vs. Ctrl-click
Typically, Ctrl-click is a way to select multiple, individual items, while Shift-click is a way to select everything between a previous selection and the current location. The Cronometer site seems to treat Shift-click like Ctrl-click, and to have no actual Shift-click equivalent. I've poked around in the forums and haven't seen that question raised, so I'll ask it here: how does one select everything from a previous selection to the current click location?
ETA: spotted a similar request over on the feature-request forum, moments after posting here. I view it more as a bug, in the sense that it diverges from UI norms, so I'll leave it in place, but I've also agreed with the other post.