Rated 5 out of 5 stars

Excellent idea and excellent implementation. Thank you!

(Perhaps a keyboard shortcut would be useful

edit: Yes, CTRL+SHIFT+W works great on linux too - good stuff. Thanks again)

This review is for a previous version of the add-on (0.7.9.4). 

Thank you for your comment and the 5-star-rating!
If you haven't already recognized: there *is* a shortcut for setting a reminder. It's CMD+SHIFT+W (on Mac) and CTRL+SHIFT+W (on Windows). Does this fit your needs?