1. sBorg supports auto-post to vB3, vB4, IPB3, PHPBB2, WP, myBB, SMF, and DLE websites.
2. No, there is no de-captcha service in sBorg to handle captcha while posting/logging in on any website (be it a forum/filehost/imagehost)
3. sBorg would allow you to post the same content to a WP blog + 1 other forum of your choice.
4. Unfortunately no. sBorg would stop working if the domain/ip/directory/any core file is altered. And yes, we do have a XAMPP bundle that can be easily installed and configured on a RDP to make sBorg functional.
5. Yes, you need to have premium accounts on all the websites you intend to download the content from.