Is it posible for you to add new picture - crosshair, and give an setup option to allow picture to follow mouse pointer without any delay and stay every time exactly in mouse cursor position? Or - better - option to use user defined picture (png or other format), for example:
oneko -nodelay -userpic path/mypic.png
oneko -nodelay -userpic path/mypic.xbm (xbm I can create using GIMP)
I can create picture of crosshair.
Pavel