When a datafield is edited in the data editor by pressing twice F2 the cursor is in the "Data Viewer and Editor". As soon the cursor is in the "Data Viewer and Editor" the mouse must be used to leave the editor or to apply the changes etc.. It should be possible to define hotkeys for at least "Apply Changes" and "Cancel Changes". After the changes has been applied or canceled the focus should go back to the origin field.

The workflow is really bad if a lot of fields have to modified with the Data Viewer and Editor. Keys for "Next Column" or "Next Row" are also a good idea to navigate without leaving the Data Viewer and Editor.