How to I get an extra field for a user profile when using EntityFieldQuery()
The result that comes from EntityFieldQuery::execute contains an array of entity types, and within each of those is an array of the entities found in the query.

The caveat is that the entity ID is actually the array key of said array, so to use user_load_multiple() you would use syntax like this:

$users = user_load_multiple(array_keys($result['user']));