Bomb Release Mode--help needed

[Tennie]

So I installed patch 4.13 from 4.12.2, and I'm liking much of it so far. However, I have come across an issue that I've been having regarding the new bombsight mechanisms, or rather a certain particular part:

I've been trying to experiment with the bomb intervalometer that's supposed to be used on bombers equipped with the Norden bombsight; however, although I've tried several different hotkey combinations, I can't seem to get the intervalometer to respond to my key presses.

For reference, when testing the new bombsight settings, I use a B-24 equipped with a loadout of 12x1000lb bombs, with Realistic Bombing on and Limited Ammo also on.

Is there something else that I'm missing here? I would appreciate your answers!