Firewall/NAT

The documentation refers to an "Auto-Add" checkbox, but I don't see it on the inbound nat page. Does this mean that I have to setup the firewall rules individually for the inbound nat?

I'm forwarding ports on several inbound ip addresses (added as aliases and arp proxys) but the firewall logs show the requests being blocked. They only start to work if I start manually creating firewall rules to allow the inbound requests.

I'm using the generic-pc-1.235.img image.

Firewall -> NAT -> Edit, on the bottom of that page, just over the Save button I have a checkbox with Auto-add a firewall rule to permit traffic through this NAT rule.
This is 1.3b16 though.