avgenie says:
I believe, similar to ETOPS for twins, ETOPS for tris /quads will require fuel planning for such eventuality (decompression). Airlines can address this by carrying additional fuel. If they do not want to carry additional fuel and forgo the payload then they will have to look for a suitable alternates enroute. Based on the limited knowledge I have on ETOPS, it appears to me that ETOPS greatly enhances the overall safety of all operations including those of tris & quads.
The present rules for three and four-engine overwater operations, taking into account three and two-engine ETP's, provides all the safety one needs without applying the imagined "safety enhancements" of ETOPS.