You must be talking about serious enterprise level firewalls. Yes, they have a lot of knobs
A home/consumer level IPv6 firewall would look just like a NAT firewall does today. Plug it
in and it allows outgoing traffic and blocks incoming traffic. Nothing hard about that!
And as a point of fact: Many home firewall/router systems also have knobs and switches. My
Linksys wireless router has an Advanced tab with all sorts of complicated things on it.
Also I have no idea why you consider stateful firewall to be an ambiguous term. It's a system
that tracks connection state (or network "flows") and allows firewall block/allow decisions to
be made based on that state.