Hello,
Regrettably, these feautures are not available in the current implementation of CAPTCHA. You can only change size of the image, you can do so in the
Page_Load method (
~\CMSPages\Dialogs\CaptchaImage.aspx.cs) :
CaptchaImage ci = new CaptchaImage(WindowHelper.GetItem("CaptchaImageText" + capcha).ToString(), 80, 20, null);where numbers 80, 20 define width and height of the image.
The good news is that there will be a new CAPTCHA feature available in the next version of Kentico CMS 6.0. It should support the refresh icon and logic CAPTCHA similar to the one you can download from the marketplace:
Logic CAPTCHA.
Best regards,
Michal Legen