How to reproduce
- Go to http://demo2.b2evolution.net/stable/admin.php?ctrl=collections&tab=blog_settings&blog=1
- See all entries under Cross posting are unchecked.
- Go to http://demo2.b2evolution.net/stable/admin.php?ctrl=collections&tab=blog_settings&blog=2
- See all entries under Cross posting are unchecked.
- Go back to http://demo2.b2evolution.net/stable/admin.php?ctrl=collections&tab=blog_settings&blog=1
- Check any box in the Cross posting section, save.
- Go back to http://demo2.b2evolution.net/stable/admin.php?ctrl=collections&tab=blog_settings&blog=2
- See same selection has been made.
If they are supposed to be universal settings then these options should be in the System backoffice section.
If they are supposed to be collection specific settings, then it's also a bug ;)
Grrrr, where is the preview button!?
These are settings that are common to/shared by all collections. In the case of cross posting it makes really sense that it's a shared setting.
Regarding URLs, yes it's one of the many problems with cross-posting... which seemed like a good idea a long time ago but isn't really that useful...
What resembles most to what you describe is to use a content block and to reference it in 2 different posts.
In that case though, comments won't be shared.