Change mouse cursor to grabbing one when moving a window

[EysseW]

Excuse me if this is already possible with bash scripting, but I'm pretty sure it is not. So my idea is to make the cursor a grabbing one when you are moving a window around by mouse with the bindm=ALT,mouse:272,movewindow thing. It's a very small thing, but it makes the session feel a lot more premium IMO.