monkeyspasm

I have what may be an odd situation but hoping someone can help! I play lightgun games in VR using Virtual Desktop - this means I have a huge screen and the Rift touch controller replicates a mouse, so works in Teknoparrot and Game Loader All RH just fine, so I can play Sega Golden Gun, Operation Ghost etc. On TC5, tt works as a mouse in the menus, but once the game starts the crosshair move to the corner. I've seen other posts with people with a similar issue, but not in my situation. I've had the same issue on a PC game (Blue Estate), and setting mouse to Raw mode in the ingame menu fixed it - don't know if there's something similar in TC5 config files, but I can't find anything. I tried to install PPjoy but to no avail on Win 10 64 bit - I don't even know if that would work anyway. Is anyone playing in VR with Virtual Desktop, by any chance? Very grateful for any help!