The goal of the OP was simply stating add re-cap to the "SIGN IN" button on the homepage, as without it (since ccore requires use of captcha to actually signin) that signin button is pointless, other than entering your login uselessly, and getting redirected to the proper signin process of user/pass/captcha.
Not sure how this turned into whether or not to use captcha, the OP didn't say remove captcha all together.
Plus not like ccore requires enter your login information twice, so the signin on the front page is of no use...