No fire/overheat indication systems on one engine means that there is a remote possibility of an aircraft threatening event occurring without adequate warning. Therefore I would assess it as a land at nearest suitable regardless of commercial or logistical concerns.
If when assessing the situation you are lead to believe that the engine is operating normally, then there is no need to unnecessarily add risk by shutting the engine down.
Last edited by Sciolistes; 15th Nov 2012 at 19:47.
Reason: Spelling