on problem here is that I don't want to share my ShowHN projects with my HN account because it'll connect my real identity to my pseudonymous HN identity.
so, in the past, i've created throwaway HN accounts for sharing things that connect to my real ID.
I'm not entirely sure that's a bad thing. If you aren't proud enough of it to attach your real name, or your pseudonymous account, maybe it shouldn't be posted.
The solution to this is to allow aliases ... or account groups if you will and then allow/disallow things based on combined karma.