About "avast firewall"... I've said multiple times that to make a quality firewall requires certain degree of expertise and skills in this field. I'm afraid we currently posses none of above.
(at least not now)
Instead of making a new firewall from the scratch, the option would be to optionally bundle avast with a 3rd party quality firewall, as a separate product, of course... We're currently investigating the possibilities in this area.
Vlk