SUMMARY Now that a default view of Spectacle has changed (love it), it would be good to add a "Close" ("X") button to the Rectangular drag view (default one). This is needed if you accidentally opened it and want to close it. The only way to do that now is with either "Esc" or actually taking a screenshot. Which is not accessible for people without keyboards or is very not UX friendly. Adding a one "X" button on the top bar will fix this. Preferably red to indicate its going to close it, but thats up to you.
Thanks for the suggestion. I'd image it wouldn't be very difficult to add a Close button on the bar with other actions, like Save and Save As. I'll forward this to the developers to consider.