Absolute mouse position driver support
ToAru has implemented a mouse driver that get absolute positions in qemu and vmware. virtualbox has its own interface which toaru also implements. Look into this feature and possibly implement it https://github.com/klange/toaruos/compare/c2163b04a6442bc47738bd9d6d71f6121bdf2bc8...36b850b57dcd6dab4a989d66b86327f5ee27afaa. This feature will be useful when there is a proper moused desktop environment. When this feature is used, clicking on the window doesn't capture.