There is a pay cursor hider with infected crack. I see this as a
$3 problem.
Figured out the dllcalls needed, so here is my CursorHide4free.
http://www.keepmyfile.com/download/adb1d41786486
This and addressbarhider, just make Opera look cleaner, with a
larger window with which to look out upon the web.
Features and purpose: Script hides mouse after 4 seconds of no
activity. Shows cursor on movement.