In some cases you would like to use the standard url/route instead of using a prefix. For example: You want to use the prefixes with certain content types/menus/languages, but not all.
I think there could be more than one solution:
1. Ad a default target in the target list with no-prefix configuration.
2. Ad a token like that you can add to the prefix field.
This option could help as well to use only prefixes in non admin pages. (now it uses de default route and the prefixes)
Needs review
1.1
Code
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.