Custom Replacement Tokens?

Is it possible to add our own list of replacement tokens, from either XML or another datasource?

Yes, you can define your own token that will be replaced and then use the LoadFile, or TransformXML, or WebCapture dynamic tokens to pull in external data.

Do you have an example anywhere that we can use?  The documentation in that area look promising, but it sure would be nice to see an example.

There is an example of LoadFile in the SavedRules. And you can also get the syntax from the drop-down list while editing a rule.

Basically, you would define your own token that will be searched for and replaced (or use something that is already in the output of the page).  So lets say you wanted to define your own token like {MyToken} and then use a webcapture of a dynamic lookup page called MyToken.aspx that is in the root of your website. 

SearchFor:

{MyToken}

ReplaceWith:
[RE:Webcapture("MyToken.aspx")]

Now you could have the MyToken.aspx file dynamically lookup anything you want to put in that custom token.