It's been almost a year since Oleg publish last version of his firmware. Since then, much has changed. There are several things that must be done. Among other things layer7 support, better QoS (preferably integrated with the web interface), a newer kernel (the last of the 2.4 line), better ipv6 support, some bugfixes, etc.
I know that some may say if you want that features write it yourself or use OpenWRT.
I do not have experience with that and i do not want change firmware because i like it.
Oleg is opensource maybe somebody know somebody who wants become this firmware developer?