Didn't say (light blades) on the critical focus (Rapier) feat description but more importantly didnt bump up my threat range for daggers (but did still for the rapier).
I’m not sure if this can be done without a lot of effort. Mythic Weapon Training allows you to apply the effects of a feat (like Weapon Focus) that normally applies to one type of weapon to apply to all weapons in the weapon group you choose. My guess is you’d have to code each possible feat as a series of virtual feats for each weapon in each group.
Yeah, this one is nasty, and would require quite a bit of effort.