Is it possible to Copy and Paste alignment zones from on master to another?
Not at the moment. Could be done with a script.
I would love to see this feature, fwiw.
You can in Glyphs 3. Select the metric rows in one master, copy with Edit → Copy (⌘C), and paste in another master with Edit → Paste (⌘V).
Thanks, Florian! And thanks, Rainer and Georg!