[ShadowChemosh]

You have to run a script that will increase the allowed number of Custom Racial Abilities by one on the races. This is actually a script that currently runs on like Humans and stuff.

For Razor Coast I created a Mechanic set to the "Razor Coast" source with the following script:
First/10000

      ~ If not human get out now
      doneif (#hasrace[rHuman] = 0)

      ~set our focus to the hero's race
      perform hero.findchild[BaseRace].setfocus
      doneif (state.isfocus = 0)
      ~ Give one Ethnicity
      focus.field[rGiveSpec].value = 1
      perform focus.assign[Helper.OptCustom]
      focus.field[rSpecName].text = "Ethnicities"

So now when the Razor Coast source is selected we give humans one Ethnicity to choose from. If you have other races you would need to modify the doneif line to include the other races. In example lets say you wanted to allow Elves to pick an Ethnicties also:

      ~ If not human or Elf get out now
      doneif (#hasrace[rHuman] + #hasrace[rElf] = 0)