I like the ability to put URLs on crossposted versions as well. If you include the ability to link to cross posted versions, particularly for hosted,

I like the ability to put URLs on crossposted versions as well.

If you include the ability to link to cross posted versions, particularly for hosted, be sure to include a u-syndication (microformat) class on it: see also: http://indieweb.org/u-syndication

For those on WordPress, it would be nice if there were built in support for the Syndication Lins plugin https://wordpress.org/plugins/syndication-links/ which covers several other services that POSSE copies and shows syndication links as well for post discovery.