I can hack this for my own system, but thought that it would be handy to have as a standard.
The popup for adding link anchors could provide a field where content for the title attribute could be entered. As it is, I have to go and put this in manually which, for me, half defeats the point of having the link element created automatically.
Links as provided:
<a href="www.foo.bar/baz">Foo Bar Baz</a>
Links as I do them:
<a href="www.foo.bar" title="page about Baz on the Foo Bar site">Foo Bar Baz</a>
Note - the title attribute is NOT just to provide a tooltip; it contributes to the semantic quality of the document and is an important aid for accessibility. (Sorry if I'm preaching to the converted.)