One issue I frequently run into if I am trying to move quickly through data entry in Fibery is using Paste (e.g. copied from an email) and accidentally pasting into the wrong field. My habit/muscle memory is to immediately Ctrl-Z to undo what I just did. Unfortunately pasted text, and indeed any text changes within a field, are not handled by the current Undo system. But they are handled by many other systems, and so I am used to being able to do this.
Worse, the Undo action will actually remove text from other fields that I’ve already edited. And since there is no “Redo” for Field contents, I often lose data I have entered. I have a separate feature request for “redo” Implement “Redo” (Ctrl-Y) in field entry
So basically, please implement in-field Undo, especially for paste actions. And I would also consider restricting Undo to the currently active field. When no field is selected, it could undo any data entry, but in many other systems I believe undo is restricted to current field selection, and this helps minimize accidental data loss.