But instead of increased patrolling and speedy deletions, this could be implemented in the Mediawiki software. If a user (logged in or IP address) tries to create a new page, their recent contribution history could be checked, and if any of their five most recently created articles (except redirects) are shorter than, say, 300 bytes, they would simply be unable to create another article. This would be a very soft kind of blocking (as soon as you have improved your existing article, you can start the next one), each case being completely an affair between the user and the software, not involving opinions of individual admins.
Such an extension (is there an "article creation hook"?) could be fully parameterized, so each community could decide where to set the limits (5 recently created articles, 300 bytes), and what message to show to the user who violates these limits.
Has this been suggested before? Has it been implemented? Would it be a really bad idea to suggest this?
I can't see any reason why it couldn't be implemented (I don't know how easy it would be). Before anyone actually spends time coding it, though, is there a consensus on the Swedish Wikipedia to use such a system or is it just your idea? If it's the latter, then you should probably establish a consensus first (since I'm not sure other projects would use the extension, it's not really worth writing if you aren't going to use it).