Why need to move it if you can just look at it? I don't know why some one need this reserving, maybe because "legacy" . One turn you don't need to shoot at all, other turn you need to kneel and burst and another turn maybe move, snap and move. Path is shows how many will remain after you move and slider shows how many you need, not very difficult.
What I want is allways see number in grenade slot how many will cost throwing of this granade.