What are "2-gen" algs?
And since we're on the subject.. what's the best way to do M moves? I grip the left and right slices and push the M slice with my right middle finger, but it often feels awkward, doesn't turn as smoothly as I'd liked, and sometimes my hands slip from holding so little. Sometimes I do r R' because it works better, but I'm sure two moves like that must be much slower than one. For M' (which thankfully is rarely necessary now), I pretty much do r' R.