The Linux Kernel 22.214.171.124 of Zeroshell is just the vanilla Kernel with the L7-Filter and IPP2P patches. I compiled it with Fedora 8.
To obtain the configuration you can use the command zcat as follows:
The next release will include load balancing and failover mechanisms for the routers. I do not think to apply any patch to do them, because I prefer an user space daemon that pings the gateways to checks their state, but, in any case I am going to investigate about the patches you suggest.