I should think that they would have stated "min. JAA CPL/ATPL required" if it was only their intention to hire JAA licensed guys. Neither Flt Int or Zoom web site make any mention of this.
Its probably because they dont have to....after all what use is an ICAO license in a JAA country? given that it stipulates you have to satisfy UK residency requirements.
Seem to remember there being many Brazilians at Ryan on validated licenses with the condition that they complete JAA conversion within one year (duration of validation).
that would be the Irish authority happily accepting all takers, and RYR being generous with their contracts...or should I say desperate.
You can convert an ICAO license to a nationally held ATPL..which effectively means you can fly aircraft registered in that "validated" country. You do however require a company to sponser you aka RYR..something I doubt Zoom will do for you.