Something like
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Mouse curser control via overlay (like a “trackball” radial desc, and/or a rect for a virtual trackpad area). I feel this is important for SCUMM
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True Analog overlay support in more cores. ScummVM, TyrQuake, etc seem to underbind overlay analogs to hard keys. I know this can get complicated as you would end up having to write a cumbersome joy->mouse routine… The previous bullet may make this one unnecessary