Scatter courses have results sorted by time -ie shortest time wins. So it doesn't work to allow someone to do fewer controls than someone else and compare the times.
We've reviewed the wording of the definitions to make this clearer:
http://maprunners.weebly.com/event-types.html
Local Administrators can edit results including changing the classifier on a result. (Although comparing times for different numbers of controls may not be particularly useful in this case).
For unlimited time score events, you should be able to use ScoreQ00 or ScoreM00 etc. But as discussed on another thread on this Forum, this has not been implemented in MapRunF as yet. So in the meantime, just use a large time limit that won't be exceeded in practice eg ScoreQ500.
For school-events (or any events), Administrators have the discretion to mark results as valid (or invalid) or add or remove penalty points.