I've been using the community edition for years and have been gathering feedback from potential employment candidates. I wanted to send a reminder to a couple of recent candidates to complete their application. I selected both applicants' unfinished surveys and customized the reminder message, but instead of choosing the Selected participants >> Send reminder, I absent-mindedly clicked the Send reminders button at the top of the screen and watched in horror as my system began sending reminders to hundreds of people whom I had not contacted in several years. I did manage to cancel the operation, but not before nearly 100 reminders had been sent.

My suggestion is that when sending REMINDERS, there be a filter that is user accessible, but with a default that will restrict reminders to only a certain period since the initial invitation (or most recent reminder) was sent.