My project builds its own model based on the parser's event stream, and hence doesn't need the QDox model classes and other paraphenelia. Pruning the JAR file reduces its size from ~58K to ~23K (on the version I happen to have checked out), a savings that some may consider irrelevant and others attractive.
However, since the license appears to permit redistribution of modified QDox JARs and in order to keep the base QDox build simple, I agree that we can drop this request and leave it to projects to subset the JAR as needed.
I think that any benefit would be outweighed by the added complexity of distributing an extra jar-file. It's simpler to keep it all together; the model classes really don't add that much overhead.
So, -1 from me.