[pgroves]

All it needs to be able to do is page-down or scroll-down and I want it (I have RSI problems in my hands).

[wizzwizz4]

You can already get a gaze-tracking program to do this. (You can prototype one in MIT Scratch – yes, really!)

[hoppyhoppy2]

I think a foot pedal might be an easier solution than a neural implant, at least for a desktop computer