Snoozing now fulfils most of these purposes for me - instead of having to keep "awaiting reply", etc. visible at all times, they simply disappear until they need my attention again. Starring them as a reminder as to why they need my attention is a good idea though.

The main feature I'm still missing is an easy way to add my own TODOs there. I currently send emails to myself, but that's quite cumbersome (press `c` for compose, enter my own email address, <Tab>, type reminder, <Ctrl>+<Enter> to send, `x` to select that email, then `b` to snooze it to the desired time - in Inbox, this would be `t`, type reminder, set snooze time, <Enter>).