Requiring an operational profile that guaranteed single engine capability in most light twins would render them useless, and extinct, in the GOM. Lots of guys (including me) have exercised less than perfect options in light twins that were OEI and improved their survival probabilities-I don't want to take that chance off the table to "improve safety." Talk to a few more pilots...
The greatest hazard in the GOM is weather. Most operators allow (read allow as REQUIRE) outbound fuel loads of destination and 30 minutes, singles and twins, VFR. There's a lot of flights made with NO fuel available enroute, and a fair few made that would require a significant diversion to find a dry place to land if the weather deteriorated. This catches a few pilots every year-it's damn difficult to make yourself put a pefectly good helo in the water. Want something that WILL improve safety in the GOM? Close this hole and give the line pilot more choices.