2 tab completion on labels, contacts
4 contact selector in edit-message-mode
7 maybe: rangefilter on the initial inbox to only consider the most recent 1000 messages
8 select all, starred, to me, etc
9 editing of arbitrary messages
10 annotations on messages
14 x auto-insertion of draft messages
16 x sent messages loader
19 x tagging for group operations
20 x view: starred, to me, etc
21 x pull in messages by subject as well in load_thread_for_
22 x reply+compose+forward
27 x search: body, to/from, tags (requires: readline)
28 x highlighting/different color stuff
29 x config: your email, sendmail, etc
30 x status: to/from_you, cc_you_others
31 x status: new/not, important