Not sure if Piney actually took issue with this or what, but it was brought up at the end of our game last night.
Bryan Anderson is my team's best WR. He also happens to be my best TE, and I only have one halfway decent TE. By putting Anderson in as my second TE and starting him as my slot receiver I can keep my best players on the field and create matchup problems at the same time. Anderson did have over 100 yards receiving with over half of that coming from the slot and the rest came from the TE position.
I don't consider this to be cheesing (and Piney never accused me of such), but wanted to run this by everyone here. I frequently move players around to match their skill sets to match what I want to do on the field. The only truly static positions, IMO, are QB, P, and K.