Highly unlikely Roku will ever allow reprogramming any remote button. As to your second issue, that is currently being performed by a CEC command, which is only capable of changing the input to the CEC device. If your cable box supports CEC, then pressing a button on that remote should switch you back to that device. Unfortunately, different manufacturers label their CEC functionality differently, so I can't tell you what to look for in the cable box settings. Roku calls it One-Touch Play. Samsung calls it AnyNet+. And so on.
Dan
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