Can you attach a deadline to a /todo ? (not the US TV host)
Maker of WIP amongst other things.

No. But if we had this feature, how would you like it to work? For example, when you don't meet the deadline what happens? (not the US TV host)

I see it more as a reminder. So it would be highlighted among all the other todos on web, and wipbot would ping you to tell you you must complete that task today