Bits Missing from DocBook

Abstract

And this is what simple markup I think is missing from DocBook. (It isn't everything (of course), but it's what I can think of consistent with simplicity)

These are all the elements I want in DocBook, but that aren't there.

<aside>: I often want to make side comments <aside>don't you?</aside>, but I don't have a way to mark it up. <phrase role="aside"/> would probably work, but it's wordy. I'd like the stylesheets to choose how to represent the aside. They could pick <aside>, parentheses, footnotes, or something else.
Other <email>-like elements: I want <jabber>, <aim>, and others. This is too many new elements, so these should probably be handled with a class attribute on <uri>. Then the stylesheets could generate the right link automatically. The stylesheets should also have an option for automatically obfuscating email addresses.