Say, just for an example only, I have a photo of a baseball bat at an angle (say 32 degrees, just for instance). I want to make the baseball bat thicker, except at the neck, which I want to stay as is, and, I want to make the blunt end of the bat to be more arched (something that warp with arch would do nicely, if the bat were straight up and down in my photo). Now, if I rotate the bat so that it is straight up and down, then use scale horizontal only to make it thicker (excluding the neck), and then use warp arch for the top end, and then, rotate the bat back to its original 32 degree angle, I'd get my result. But, if the bat has a pattern on it, like letters and some design, all that will lose details in the double rotation. I'd like to apply the warp arch at an angle, and, I'd like to apply the scale horizontal at an angle.
If I could use the "M" option to select the bat, but, have the "M" rectangle rotated 32 degrees before I make the selection, then, that would avoid me having to rotate my selection (the bat).
Maybe I'm not explaining it clearly - there is a difference.