No need for a branch (probably) - it'll be a matter of finding and implementing the best settings, maybe an extra comb filter switch or two. It's probably time I look into EFM/CD decoding though - if my test mode trick for playing PAL disks actually works I'll need it. (It sort of does, but there is color distortion that may or may not be from the NTSC->PAL conversion the disk I have uses)
I also might document the TBC output so that people can play with making new comb filters.