I've been testing out the <a plugin</a>. It doesn't work
very reliable, but can keep the last couple played
stations under →favourites→history. So jumping back
to the previous one is definitely implementable.
<p>
Channel/genre importing as .m3u seems entirely feasible.
The UI doesn't yet support that, but I actually planned
on adding selections; which could then be exported with
the existing →station→save feature.
<p>
In the meantime a simple cache-to-m3u command line tool
might help. All station listings are saved as JSON after
all..