How do I turn off confirmation dialogues? If Blender 2.77a has a user-configurable 'turn delete confirmations' on/off setting, it's sure hidden. To be clear: in Object Mode, for instance, when you key X or press the Delete button on a selected object, a confirmation dialog pops up - confirmations slow my work flow. 

Two years ago, an answer to this question (Remove Unnecessary Confirmation Popups ... ) said they were removed - so perhaps this feature is still unavailable?
I don't know if you can user configure it, but you can speed up the editing by pressing XD.

XEnter or X1 also works, but it's probably slower. You also can change the default shortcut for delete to D and then press D twice.