I'm 6'-3" and would love to have a few more inches of leg room. I'm having a hard time understanding what cutting the gas pedal off would do, and I don't know where the foam is located. I'll take a look at both when I'm driving home tonight.
I drive with the seat all the way back, but wish it would go back further. I added 3/8" of washers under the front of the seat where it's bolted down to the floor which helped a little by raising the front of the seat. 3/8" was all I could add and still maintain full thread contact with the bolts. I had to grind the hole opening in the seat rail (with a rotary tool) a little toward the front due to the angle change, but didn't compromisse any strength. I might take the seat out one of these days to see if I can drill the rivets out and move the seat back on the rails an inch or two. I liked the improvement the washers made enough that I did it on the Cherokee too.
I'm looking for any other suggestions on getting more leg room if anyone has any.
The F150 is the only car I've ever had where the seats go back more than I need.