looking for tips on supercite

[Alan Schmitt]

Hello,

I've recently started using Supercite, and I'm looking for tips on it.
More specifically, I wonder if people have written functions for the
following.

Filling: the manual cites two old packages that do not seem to be
maintained (filladapt and gin-mode). When I need to fill I manually
change the fill-prefix to the one needed, then I change it back. Is
there a way to automatically guess the fill-prefix?

Citing: Supercite automatically cites uncited lines. Is it possible to
also cite previously cited lines (which are typically in nested format).
Here is an example. If I get this email from bar:

foo writes

hello

hello

And I reply, I would like something like

foo> hello
bar> hello

(Ideally, I would like a mix of nested and not nested, like this:

foo>> hello
bar> hello

but it seems to require changes to Supercite itself,
http://gnu.emacs.gnus.narkive.com/kCzn4WRX/how-to-mix-nested-and-non-nested-citations)

Are these possible?

Thanks a lot,

Alan