Well, after my last post (just as I was hitting send) I realized what stevesh pointed out that this is different than the google recaptcha to which I referenced... It appears that no formal thread was established for this version and perhaps it was an expansion to the other one without realizing it. But, the google recaptcha does offer the capability of applying it to the contact us page as well as other areas and the author does check the thread rather regularly, though this topic is already covered in it I am pretty sure...

Today having looked at the plugin information (not the files yet) it does appear that there is some expectation of admin options being in at least one of the downloads... Might be in the older one?

Anyways, if I get a chance (not too likely in the next day or so) I'll take a look, but other than that the other recaptcha mod works. As to issues with the contact_us page, well... Depending on versions of things it may be that the anti-spam code of more recent versions of ZC is not properly/fully implemented...