Re 4) above: You need to say 'default_value revision_id,asc' (with comma direction) in order for it to work.
Re 5) above: I've added an -orderby_name switch to let you set the name of the orderby filter.
However, the same problem applies to 'groupby' and 'page' (for pagination). I haven't fixed those. Also, if you have filters with the same name in two lists, you're also in trouble.
I think the right solution would be to let you prepend the list name to all your query variables, so as to completely separate the namespaces of multiple lists on the same page. That'll take a little longer to do, though. (Funding will be accepted :))
/Lars
