Remathilis
Legend
From a practical standpoint, there isn't much reason balance-reasons to not allow those feats. I could see (for example) Infernal Constitution or Dragon Hide as clever ways to get several racial traits that could represent unique races.
HOWEVER
I'm also leery of saying "custom lineage = normal race" at this point, mostly because I still prefer the races still stand for something. Your custom lineage might look like an elf, but they're not mechanically an elf, they are unique entity and doesn't count as an elf for purposes of being immune to ghoul paralysis, making boot of elvenkind, or taking elven feats.
HOWEVER
I'm also leery of saying "custom lineage = normal race" at this point, mostly because I still prefer the races still stand for something. Your custom lineage might look like an elf, but they're not mechanically an elf, they are unique entity and doesn't count as an elf for purposes of being immune to ghoul paralysis, making boot of elvenkind, or taking elven feats.