I'd prefer if you'd not post that link in my thread, wrongly modifying up_param is one of the few ways to irreparably hardbrick your samsung device.
I don't get why you'd want to take that risk just for changing an image that is only shown for a few seconds.
That's because sadly android handles the pen like a mouse which means it would normally show a mouse cursor
You currently can't have two separate cursors for mouse and stylus in AOSP based ROMs.
Edit it, sorry.
And thank you