@nestort@quitter.no Actually, you don't have to store a message as a draft in order to search for a user or for a message to mention. You need to close soft keyboard only in order to free some space for a Timeline. And then you can search and scroll results without closing the Message Editor.
Yes, AndStatus stores information on all users, whose messages were ever downloaded. Currently there is no any limit on a number of stored users. We are planning to implement new User views (in addition to a Timeline views). See https://github.com/andstatus/andstatus/issues/224