We operate in tropical weather so we do a lot of that flaps 1+F after landing. It makes no difference as far as the function of the TO config pb goes. We press it on taxi pattern flow we use before running the before takeoff check. Our aircraft also test for "flaps on feasible takeoff config", it doesn't give a monkey whether that's 1+F, 2 or 3, something I feel it could be quite handy for us as we usually use 1+F for most takeoffs and therefore one can easily select 1+F from memory instead of 3...