Yes, this is intended to be a dual purpose breed.
As adults I'll be keeping track individually after the third generation. During the mixing phase I'll sort out white or light colored birds, birds that are agressive, or that struggle with cold or heat. Birds will be preferentially kept that have good predator evasion, grow quickly, and are excellent foragers. Once I have three or four way mixes with my selected breeds, the criteria will expand.
Fertility (or the ability to breed without my help) looks like it's going to be another that I hadn't thought of. 100% of the Biel x Dom eggs I set were duds. I set three more to see if I get any at all. They're in the pen for harvest tonight, so doesn't look like they'll be passing on that rose comb I wanted.