Credit those who helped by including a stylish list of names after any post, potentially including a Gravatar and link for each.
No. The All Due Credit control is generated on-the-fly, and it is added right after the post content. Furthermore, All Due Credit will never appear on the home page of your blog, only when you view a specific post.
There are a huge variety of WordPress themes available out there, some of which make major modifications to the styles of WordPress. Since All Due Credit inherits these styles, sometimes this results in layout issues. I've been progressing on handling differences introduced by themes, so keep an eye out for new versions. If you have problems with a specific theme, I'd be happy to take a look and see if I can help.
Only with the 'Thanks to' field, at the moment. Multiple names in the 'Thanks to' field, delimited by semi-colon (;), will automatically be converted to multiple 'Thanks to' entries in All Due Credit. The other four labels don't currently support this.
No. The e-mail is encrypted right before we use it, and is only used to request the person's Gravatar.