Sorry for sending the thread off on a tangent - I just wanted to point out an issue that I thought should be considered. Not the only, or most important issue.
I honestly didn't think my comments would cause such a fuss. I thought people would just say "sure - there might be an increased risk of an IFSD relative to a twin but this isn't important because diversion on 2 engines isn't a big deal in a 747".
Anyway, if anyone wants to discuss the IFSD probability issue further please send me a PM.