Hi,
May I suggest contacting Jetstream Designs. Their contact information (and other developers’, as well) can be found on this page.
Puffin Flight can’t self-exclude their own stuff. The exclusion has to happen either from the scenery that you’re doing the replacing with, or from a completely separate scenery package that has a higher in priority than We Love VFR, and a lower priority than JetStream’s LIML. I hope that makes sense!