I got this idea from the new (and wonderful) multi-notifications feature in OF3.
The one thing that would complete my to-do workflow would be to be able to switch any action into a “nag mode.” So that it reminds/notifies me every five minutes and can optionally be snoozed for fifteen minutes. This nagging continues forever until marked complete (or for X hours or times).
These lengths (five and fifteen) are also configurable.
This mode would be either manually activated, or associated to the due date or a notification.
This is exactly the functionality of the Alarmed iOS app, which I use even more than OmniFocus. It would be wonderful for these features to be integrated into OmniFocus.
(Also sending this to OF support.)