mouse sync issues on KVM machines very annoying

Currently running 3 machines and they all have the same issues. There are two mouses that show up and they are far apart. It becomes quite a chllange to do any thing and it is pain especially when installing from scratch.

How would I be able to sync them in cloudmin

I learnt that running KVMs with the following would do the trick but how would I append this from the webmin? I basically want this for every VM

-usb -usbdevice tablet

Thanks :(