[CentOS] IPv6 under Centos?

I wonder if anyone is running IPv6 under Centos-5.2? Particularly with shorewall?

I see that shorewall6 is specifically designed for updating shorewall to IPv6, as described in http://www.shorewall.net/IPv6Support.html.

Unfortunately, this explicity requires kernel 2.6.25 or later, and iptables 1.4.0 or later, both of which are later than any versions I've seen on a Centos repository.

I'm wondering how safe it would be to install Fedora versions of the required kernel and iptables?

Or is there any alternative to shorewall that is IPv6 compatible? I don't really want to run iptables directly, unless forced to do so, as I have found shorewall very reliable and simple to configure.