The shift light can be ignored unless you find it annoying. Traction control may save you in the rain but does not do wonders for dry pavement. However, the traction control on the 03/04 modes is more refined and less of a hasstle as it was with the 99/01 models. I am so used to turning it off after starting it that it has become a habit.

just be cautious when making left turns into traffic when you need to punch it hard, you will slide sideways for a bit. Try not to spin a donut when pulling out into traffic.
As for oil changes, at least the ford dealer will use a known brand of oil filter. I have had one oil change as a free service since my wife (now ex) had a deal with a tire store but she could not use the oil change offer since her warrenty required Acura or Honda parts to be used. What kind of filter brand is bulldog anyway? That was the cheeziest filter I ever saw. When it comes to changing oil, I only trust myself to do it.