The ability to link cross site duplicates
The first one is both a duplicate of the 2nd and also belongs to superuser.com
As cross duplicate is not possible, we have to close it as belongs to... then when it's moved to the other site set it as duplicate.
There is 2 problems:
- This need 2 action
- In my case when it's on superuser I can't close it as duplicate because of my low reputation. So if the question is moved, may be it will never be set as duplicate
So it would be nice to close it (on serverfault) as a duplicate of superuser question, and as the duplicate is cross site the question would also be moved from SF to SU.
I agree that in some case duplicate can exist across site because answer will be different, but in this case the question is out of the scope of SF and has duplicate on SU, so beeing able to close as duplicate of SU would be nice.