This is currently being done with many, many systems, primarily so you don't inadvertently turn off the keyboard when accidentally touching the power button. Same holds true with cellular telephones, GPS systems, etc...
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)