aerocat
you should always fly an approach safely...now, once in awhile there are unique circumstances that have you modify things a bit...mind you not alot but just a bit.
you should certainly never bust minimums.
but sometimes I can see doing a dive and drive instead of constant descent...it really depends on what you expect to see near the MDA and different points along the apch
you should also never leave the safety of the MDA unless you are sure you can fly to the airport / runway visually.