Well, I thought about the same when I was working on it, but due to time constraints I decided to omit the reload button. It should be reintroduced once we get 5.0 stable.
Also I would actually disable the captcha till I get the first spam comment.
Today hosting providers will fight spam before it even gets to your server. Also in ccomment5 the form is generated with javascript, which makes it "invisible" for most of the current spambots. Someone would need to write a spam bot that specifically targets ccomment in order to abuse the form & I don't think that this will happen very fast.