Including sort of honeypot to avoid spam?

Hi,
I am using your plugin and really like it.
I just wanted to ask if it’s possible to include a sort of honeypot spam protection, additionally to the captchas. The reason why I’m asking is, that caching plugins always have problems with captchas. Currently the choice is between spam protection with captcha and no caching and no spam protection and caching.
Maybe you can add a caching-friendly spam protection as a additional possibility?

thx