I guess the same argument can be made for the tips. On my first 7 I used Tinnerman washers to secure the tips. They look pretty good. You could also paint them and the tops of the screw if you want that look.
Personally I don't think the unpainted screws in the tank look that bad. If you wait a couple of weeks you can them tight enough without damaging the paint. Brush a little Chapstik on the bevel of the screw so it won't grab the paint.
Both methods work. Just remember that Murphy will occupy the second seat shortly after you paint tank with the screws in!!!!