I am in favour of using named parameters all the time, even for required args, for the reasons that Tammy put forth.
Regardless of what the toolkit currently is, we ought to focus our thoughts on what we want it to become. Since we supposedly want it to become well-used, it's better to make the code as clear as possible for new (as well as old) programmers than to make it as frictionless as possible for the non-OpenACS Tcl croud (if you could call it a croud).
