I question the need for both a cooldown and total post limit.
The average player probably logs on the forum (if at all) after a night of playing, quickly skim through the forums and reply to those discussions he/she is interested in taking part. The cooldown means he/she will probably stop after the first post and just go to bed. This is counter productive to building a community.
Remember we don't skim over everything first and then decide, okay, this is the one I'm most interested in, I guess I'll use my 15 minutes here.
As for character limit, I wonder if the devs have considered that character count for Japanese and English are very different. I would hope the limit is at least relaxed to 3,000 characters.
