> I do.  A very useful feature.

I'm sure most desktop.el users do.

My point was that I'm particularly inadequate to think how to extend the
desktop feature, because my use of Emacs in general is atypically
simplistic: one frame (two on very specific occasions), no speedbar, no
toolbar, few windows. And I don't keep Emacs running for long or use it in
daemon mode. I usually start Emacs many, many times a day.