How to add a folder in sitemap but not display it in anywhere?
PermalinkThe Custom Attributes of the page does not prevent it from appearing in the URL or breadcrumbs.
Are there any addons that can do this?

http://www.concrete5.org/documentation/how-tos/editors/make-custom-...
Maybe that'll help.
"Exclude from nav" is not working in new version of c5...
I just noticed that...
But in older one was working - and i used this feature pretty often...
You say that your autonav isn't working in the new version? What exactly is the problem you're having? Everything works fine for me, with the one exception that pages are not showing up in the breadcrumb nav if they have the "exclude_nav" attribute checked. (In prior versions, pages would always show up in the breadcrumb nav even if they had the "exclude_nav" attribute checked, but in 5.6 they are now excluded -- which might actually make more sense to some, but not to me).