Edit: the following was directed at OP, was too slow to type :-)
Quite right, but, err, *cough*, you can just open every input device that comes across. In most cases, that is. You get input events, and frankly probably don't care if that's from the touchscreen or an USB digitizer tablet that some mad-minded hacker managed to connect to the kindle...
There would however be reasons from a security standpoint against this. But there are much, much bigger security flaws to fix first (thinking of my K3 running everything and the kitchen sink as root, probably just because system integrators were lazy).
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