This is a feature present on the Roland training module thing, that's actually quite interesting and powerful.
It consists on basically dividing your metronome training in either 4 or 8 bars. So, the first 2 of the 4 or the first 4 of the 8 bars, you can hear the click normally, and then in the remaining bars, it will go mute so that you have to go on your own without an actual click and then when the click comes back at the beginning of the new bar, you could see if you're either rushing or dragging the time. This is an AWESOME and greatly helpful way to improve the inner tempo any musician should have.
Please let this proposal be considered