Sounds good to me. I think I advocated this sort of thing before, but there wasn't much consensus. It is definitely easier to use a standardized naming convention. It is also used by acs templating to define procedures for form widgets.
Yes Dave, you and others advocated it some time ago here: https://openacs.org/forums/message-view?message_id=137070 - unfortunately I never got around following up on it, but I still think it would make things a lot easier to use namespaces for this.