Please can you allow more than 2 cursors (on all axes).
It would be really useful when doing some measurements if this was possible. If you don't want this to be a standard option, perhaps it could be a configurable option. I can't see any reason to limit the number of cursors.
Also, you might want to consider adding cursors to a menu item, as I struggled to find them to start with, until I noticed the tiny little squares in the corners, after resorting to reading the manual!