If you are not applying until next year and plan on taking the test again in April it is a waste of time and resorces since when the april scores are sent out, this score will go too. If you are only planing on taking it this time, then send them out now and save the hassel of dealing with it later.
The spaces are for up to 6 non-aamc schools. There are some MD schools that are not aamc too so they are for them. But if you read more on the slip, you have copy the numbers over to a sheet at the MCAT anyway, so don't worry about that sheet too much. There are just there so it is easier to find them when you need them.