Working on a larger screen, I often find myself "losing" the cursor as it is quite fine. (which in other means is good and fully perfect for the purpose), especially on the gray background of the non-canvas area (and having multiple screens) it can get lost quite easy.
So my simple though was: how about a halo on the backdrop, something like this:
Quite subtle but still pretty visible from the corner of the eye.
I'd be glad if you could consider this and thank you for the great software!