1. 3000' speed reducing...
2. Why did the flaps fail? If it is between 5 - 10 then is there a possibility that you could get more flaps extended by taking a little more time?
3. How much reverse? Just check in your QRH. Nb this is all about brakes on speed, so if you roll a little with the auto brakes off then gently apply brakes, you can frequently do away with the schedule.
4. They haven't always done this, started with an FMC update that we had...
5. We used to taxi in, shut down and have a look at the sections of flap. If they were actually contaminated then we called then eng. Most of the time, they would be alright.