After reading what Scott wrote, I took a look into the code and documentation for MT 3.0, and it turns out that my Optional-Redirect plugin is of no use with the new version of MT. MTCommentAuthorLink now supports the no_redirect argument to turn off the redirection "feature".
For example:
<$MTCommentAuthorLink no_redirect="1"$>
Thanks for taking the time to look into this, David. It's nice to see that they have added something similar to your code as a "feature" in the new release.
Thanks for the information. I just wish they would add it to the docs. Took a bit to figure this out.