It was designed that way to prevent post/comment flood.
It's possible to increase the delay but because the submit function doesn't register a failure (empty fields, illegal character set or wrong urls), you'll have to wait a few seconds.
Boobs and I will see if we can easily fix that.
if we can easily fix that
for the record, "it shouldn't be this way but it'd be too much work to fix it" is perfectly acceptable if that turns out to be the case
(post is archived)