The registration is closed temporarily, as Raz still has a few things to sort out with the site. I can't say when it'll open again, but hopefully soon! (If the registration does open, as I'm not 100% on this topic, it probably just opens when you aren't looking!)
As for the character limit, I suggest deleting characters that are collecting dust. Being that the limit is about 100, I highly doubt that you actively use every single one over the course of a week. X3