I know on my 02 vet there is a code sequence through the dash functions to set how hard the windows go up and down. there is no indexing on my vet.
but my 05 stang has it. and i set that by holding down all the way and hold a few secs, sets down. same for up all way hold few secs and its indexed.
Hope that helps a little as well.
hated to use mustang example... sorry