Disable based on cookie existence?

I have been seeing some weird issues with our EDD ecommerce site when using this plugin. Took me days to track it down but the edd_items_in_cart cookie is getting deleted when the Flying Pages requests get sent for some reason.

The home page and /features/ pages and occassionally others send back response headers including

set-cookie: edd_items_in_cart=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT; Max-Age=0; path=/

If we can turn off Flying Pages when that cookie and a few others exist it would be extremely helpful.

Might resort to disabling the plugin entirely when that cookie exists in the mean time as we love what it offers for users when they don’t need uncached requests.

Would be even better if we could figure out why those requests come back with headers to delete the cookie we need to keep. Then we could leave Flying Pages active and they would just preload a copy of the fresh page with their personalized stuff there as well.

The page I need help with: [log in to see the link]