Changing "Ability Scope"?

Hi,

I was wondering if anyone knows what "Ability Scope" (found in Racial Traits and Society Types for instance) can be changed to? All those I've looked at say "Galaxy - This Player", so I'm not sure what other possibilities there are.

I'm particularly interested in knowing whether the scope can be changed to human players only, instead of "this player"? (as I assume "this player" would allow the trait to be picked up by the AI?) If this can be done, what's the exact wording for it?

What I would like to do, eventually, is add some new ship components and make them available to human players only. I hope I'm following the correct path to do this. If not, I would appreciate your advice.

Thanks for any help.