Thanks! Just looked into this further. The guidelines say you should use the original title when submitting a story. But what if this title is uninformative and the subtitle is too long? Then you have to summarise. I don't think it's acceptable for a moderator to edit this summary, without giving any notice to readers (this was done several times to me). He should kill the whole submission instead if he doesn't like the title.
Apart from that, I guess it would be much better if submitters had a chance to indicate why they find their submission interesting. Just a thought.