gnow, didn't you read the post in which it was made rather clear that you can't blow the floats with the gear up, then put the gear down without puncturing the floats, at least on the S76?
Why you believe that the gear being down will make the helicopter roll is beyond me. I would always put the gear down before ditching in an S76. And the S76 has an airspeed limitation with the gear down, and the doors are certainly stressed to withstand flying for any period below that airspeed. In short, going offshore with the gear pinned down is not a problem, as long as the fuel and airspeed limits are planned for. Some types might present some problems, but the RFM and MEL should tell you what those are.