A319
Flight Crew Air Transport Pilot (ATP)
Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Unstabilized Approach; Inflight Event / Encounter Fuel Issue
Aircraft
During approach briefing; we briefed the approach to RWY 26R in Miami. We also briefed the possibility of moving to RWY 26L if it was available. The brief was to use full flaps on the short runway (26R) and flaps 3 if we were able to sidestep to the long runway (26L). Having done this probably a hundred times in every other airplane I've flown; the one thing we neglected to brief was the necessity of changing the Perf page and the flap 3 button.During the last 1000 feet the airplane started squawking at us for not having selected full flaps to match the selection of the button. I saw what had happened and also saw we only had a little over 6;000 LBS of fuel remaining. I asked First Officer to continue the approach and selected full flaps to quiet the aircraft yelling at us. I felt uncomfortable with the thought of going around at this fuel level which was the reason I asked him to continue.This was the first time I had done this sidestep maneuver in this model aircraft. It was a learning experience because I found this aircraft requires too much computer work to even consider attempting this type of maneuver again. Having easily performed this so many times; I just wrongly assumed that it was this easy to accomplish in this airplane.It takes too much work to attempt this type of maneuver this close to the airport. I will not attempt this again in this model airplane.
A319 Captain reported a GPWS warning for flap setting following a side step maneuver to a longer runway.