In my case, I have a package that keeps getting installed automatically, then I
manually uninstall it, then it comes back.

I want to uninstall it and mark it as taboo (never install). But presently I
have to do this in two steps, first uninstall, then run the tool again, find
the package again, mark as taboo.

It really should be possible to mark an installed package as taboo also.
Perhaps the context menu text would be "taboo (uninstall, then never install)".

It's a minor problem, but hopefully also a minor change in the code. I think
it's worth doing this.