I think the recent changes to the Pop up are excellent.
There are a few other additional feature its missing which would be handy
1. the ability to show the popup on X number of pages viewed. I'd personally like to only display the popup on the 3rd page viewed per session.
2. Add Session Based
Show this popup once every user session.
3. Disable on mobile devices
ie dont show when the user agent is a mobile browser or tablet browser.