Xtea said:
As of now, I guess you can't. I'm happy with that limit though, at least one person doesn't flood all of the comments in a minute.
There's that limit because there's a flood on comments without it. And it's a pain to delete them afterwards. There's a few users that would post more than 20 comments in one hour if that limit was lift.

Instead of dealing with the deletion and possible banning I decided to put such a "hard" limit.