Thanks for bringing this up. In general, i am in favor of trying to make advanced (and other) settings available from some high level point of view. From your three points i think “disabling Read Receipts” is not neccessary, however. Read Receipts are only sent in reply to Chat messages, not normal e-mails. Therefore i think it’s fine to keep the default of sending read receipts as this is what other messengers also do.