Actaully one more POD left it's aclitem :). In Java for e.g. it is used to obtain column priviliges, I assume some folks may want to use it too.
I tested only recv :-(
Acually I don't know if idea of such format is OK, but my intention was to send roles names, so driver don't need to ask for name (like for regproc) and to keep together human-based approch (text) and binary approch.