2Strops - I am clearly not an S92 pilot but I believe the answer to both your questions is No!
The Mk 3 and 3A Sea Kings have a RoA of 240nm on an average day which the S92 can't get near (the S61 used to tote approx 195nm RoA).
From the information available, the S92's extra tanks fit is an internal one and therefore at the expense of cabin space. There are various claims on the time required to fit the overload tanks but you can be sure it won't be within the normal RS15. I believe the RoA with them fitted is 300nm but this may be more spin
