Hmm, I realized this solution has some limitations. If you open for example a battery module settings, the dialog appears with the controls on the right. E simply has no possibility to do that globally because some dialogs use different border styles (close, min, max buttons) or noresize (close button only).
It means, I have two options:
1. Let it be just with one left part and let's call it an experimental feature
2. I would add another left parts for all dialogs and user needs to assign this feature for each dialog. Not elegant but working. Labours for me so goto 1
Also there can appear some unpredictable issues I haven' noticed so far. Let's hope I doing it right...
I do not expect E developers will add more elegant way to make this globally
S