I was thinking about combat skills and how I’d prefer there weren’t any and people who were good at fighting could just fight well.
Then I wondered if there were other areas with similar skills that were good in a larp. Obvious ones like “hiding” and “sneaking” of course come to mind but I was wondering about “mapping” skills in a WYSIWYG kind of way.
Languages occured to me to be an area where some people know them and most don’t. We could map modern languages to racial languages. Something like:
French = Elvish
Maori = Fairy
etc…
That way, if you know the language, you can be the race and if you don’t you can’t. Elves would be rare and would talk with a sexy accent 

I don’t know about anyone else, but one of the things I like about Larping, is the fact that it differs from real life. If you incorporate real languages into a game, you have to realise that, whether intentional or not you also incorporate the real life associations people make with the language. For example, if I were confronted by an elf speaking french, the first thing I would think of is the knights from Monty Python and the holy grail, not something I find particularly elfish. Another thing to consider is what about players who have human characters that are Italian, French or Polynesian and wish ?