When researching this I came across a few tools for using a phone as a trackpad, for example: https://play.google.com/store/apps/details?id=com.thingsstuff.tou

When researching this I came across a few tools for using a phone as a trackpad, for example: https://play.google.com/store/apps/details?id=com.thingsstuff.touchpad&hl=en https://play.google.com/store/apps/details?id=com.thingsstuf... We couldn't find anything which worked as a digitiser and that is certinaly something we're considering.