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This has nothing to do with security as people still need to fill out the Captcha (if it runs on your site). This has to do with usability, you simply save people the pain of having to fill out a new form. If course it can still be cracked...
I don't have an easy answer though: you'll need to hack the module and add extra variables. These variables are the default contents of the input fields in Liaise. If you are not a programmer, you may consider finding a freelancer (I'm no programmer, I've never rented a freelancer so I cannot advise on this).
Hey, if you hack Liaise so that it can do this: share your hack with the community