Serbia has recognised secession by Macedonia and Montenegro with no problems, only asked Serb areas of Croatia and Bosnia stay with Serbia, and only asks same of Kosovo.
The Presevo Valley is a good bargaining chip for North Kosovo. Its worth noting Kosovar expansionist ambitions in Prsevo and Macedonia.
Also their treatment of Roma in Kosovo
Read: http://en.wikipedia.org/wiki/Roma_in_Mitrovica_Camps for details of same.