Some of the items are truly missing (or have not been implemented for a reason). The inboxes of selected databases are never synced, only the Sync group. That is what it was designed for.
RTFs cannot be edited (like in almost any other iOS app) because iOS has no RTF editor. So simple
This is definitely planned, but it requires the new sync technology, which has just been released as a beta, see this blogpost.
Moving files between groups or databases should be available once the new sync leaves beta phase or shortly thereafter.