I do this when I'm forced to work at a desk. Though presently I'm sitting- well, reclining across two chairs, my keyboard in my lap. My mouse is sitting on a ta

I do this when I'm forced to work at a desk. Though presently I'm sitting- well, reclining across two chairs, my keyboard in my lap. My mouse is sitting on a table to my right, so I actually raise my arm so it's at a 90 degree angle from my body to use the mouse. That works pretty well (incidentally, I'm reclining to spare my knees - keeping them bent for hours at a time is not a good thing, better to leave them straight. )