Q) What is SE1 and in what situations is it preferably to using over SE0?
As for suggestions...
I would say that anyone with less than say 25 posts who tries to start a new thread gets taken to a pseudo forum where automatic and fake replies are taken (just a mix of the regular responses people give her including appropriate links). Then they can be there in the pseudo forum for a bit until they catch on.
I have always been a big opponent to letting people make threads until they have spent time reading and contributing on forums. Especially a forum like this whose point is not for hit and run questions.
Make it so people need 25 posts to make a thread then you got a chance to catch people spamming posts to get to start a thread before they can ever make it.