i don't even see the need for this over some other checkboxes i would like to see implemented first. the one i would love to see most atm would be to have one for the fair so you can undo the "dont show this again". the most elegant way would be to move it into fairs main screen so you can check and uncheck it from there. the only way to get it back right now is to clear your browsers saved information.
that being said, if you want to put a checkbox on the event window for stamina then you would have to put all events on seperate windows since its one window for stamina, cerb, baal, lady, stamina, level rewards, etc to avoid of your one checkbox ticking all off at the same time. as i dont care for level rewards and stamina reminders, i do care a lot for the banish and lady reminders.