Here's the issue willerboi said on discord someone should post :P

1.7 had a feature where you could press a special "Corporea Request" hotkey while hovering in NEI and issue corporea requests. It would use the item count specified in the little number entry box in NEI, and I think you could also hold combinations of Shift and Ctrl to change the amount of items per request. Here's an old vasgoo video of the feature https://www.youtube.com/watch?v=uWFwAIhcOe0

This doesn't exist for JEI :(

One consideration here is that JEI doesn't have the weird number entry box that NEI has. Could possibly be replicated with a little popup dialog or something.