I did play with that earlier, but that's cursor position not delta x/y. As such it's range is limited by screen resolution (plus it's filtered by muse sensitivity settings, like how many mm movement = 1 pixel, acceleration settings etc. ).
At least that's all I could get from it earlier, if you know how to get raw data that'd be mostly perfect!
Also I considered reading the events from /dev/mouse0 with a bash script to log the output , but I've really no idea how to actually do that.
EDITED: 12 Apr 2016 22:59 by KOSWIX