Firstly, thanks again for 404 Redirected, it looks awesome.
I have a couple of hidden pages on my site that I never want returned in search results, including those generated by 404 Redirected's "suggested pages" feature.
I've submitted an idea for adding hidden pages to the WordPress core, but it's probably not going to happen any time soon. In the mean time could you add the ability to exclude specific pages to 404 Redirected? Integrating with WP Hide Post may help.