I just now upgraded from the Free to Pro version and I wanted to immediately take advantage of Ask to Connect (the primary reason I bought it). Basically set up a “deny unless explicitly allowed rule” and I figured attempting to clear the list would make this work from the start. A bit slow initially, but it works out.
But the biggest problem is trying to clear out the app list manually. I was able to clear it, but it took a little time because I had a lot of programs when using the free version.
My suggestion is some kind of option to quickly clear the app settings on the firewall tab, to make it easier to start fresh. Especially useful for someone like me who just upgraded and wants to require approval for an app to connect or has a ton of programs to clear out.
This would be a pretty big action, so if it were to be implemented, it should ask for a confirmation.