Since you don't like regular magic loop I'm not sure how I hold the needles will make much difference since it's kind of a different technique.
Longer cables do require more slipping the stitches, but I don't mind that since I'm getting a fabric I like. With modified ml you'll get a bit more slipping of stitches on the cable as well if you use a longer cable I would think.
I even make preemie hats with ML so I think it's the cable length not the needle length.