Using OR with EntityFieldQuery I have never had the need to do this before today, but it doesn't seem like you can make OR queries with EntityFieldQuery, since db_or is used for select queries.

An example would get to all entities that has a date field where the value is null or after today.

Am I missing something or some trick or is this simply not supported?
I have seen a solution of this problem. The idea is to use addTag() in query and implement hook_query_TAG_alter(), where you have good old SelectQuery object.