CORRECTION: yes it *does* work, but APPARENTLY it works *PROVIDED* I don't have any shift-enter in the label text, or it won't wrap ANY lines... *OR* maybe the point is that I need to have set such properties values BEFORE creating the label, not sure about it yet.
Anyway, editing is on ONE LINE, and I have small nodes with short labels AND GREATER NODES with LONG TEXT on *VARIOUS* LINES.
No chances to have a multi-line text editor, like the text fields in Inkscape?
(If no, I'm afraid I'll have to stick with Inkscape for now, well I was starting to like yEd but this is a work in progress with feedback from many persons and I'll certainly have to edit the text quite a bit in the future.)
THANKS ANYWAY!