There is a line in the db.
popohat for example
2289,Chapéu_Fedorento,Chapéu Fedorento,5,20,,700,,0,,0,0xFFFFFFFF,7,2,256,,0,0,76,{ bonus2 bSubRace,RC_DemiHuman,10; },{},{}
I did that from the Brazilian db that I have, so it is in portuguese. But the number in red is where you change it.
If you want to make it refinable
2289,Chapéu_Fedorento,Chapéu Fedorento,5,20,,700,,0,,0,0xFFFFFFFF,7,2,256,,0,1,76,{ bonus2 bSubRace,RC_DemiHuman,10; },{},{}
ChokituBR's post in H>LMS Script was marked as the answer