Etherpad has issues when deleting pads with a lot of revisions (total freeze, confirmed with 72,000 revisions). To avoid freeze of your Etherpad instance, you can use a job queue, provided by MyPads, to safely handle the deletion of pads. See details on https://framagit.org/framasoft/Etherpad/ep_mypads/wikis/Use-the-job-queue.
When you share a folder to someone, using his/her email address, you have to know exactly the case (ie JaneDoe@example.org) or MyPads won't find the user. This option makes MyPads search for email address case insensitive.
You can display a message on login and subscribe pages. English language will be used as fallback if user’s language is not defined or empty. HTML is authorized, be careful!