I have a changeling character with the Racial Emulation (Races of Eberron 110) feat, whose benefit says:
When you use your minor change shape ability to assume the form of a humanoid creature, you can also emulate any of that humanoid’s subtypes. Though you do not gain any of the humanoid’s traits, you are considered to be a member of that race for all other purposes (allowing you to use magic items or spells keyed to race, for example). You can also ignore the normal penalty on Disguise checks when disguising yourself as a different race…. You can only emulate one race at a time, and you always retain the shapechanger subtype.
What effect does "emulating" a humanoid's subtypes give? The feat says you don't get "the humanoid's traits," but do you get the subtype's abilities? Are those "traits," and if so, are they "the humanoid's traits"? A few subtypes use the word "traits," but many don't: does that matter?