Sure, you can do the same thing for the wake up and shut down of the N8x0,
again, emelfm2
/usr/share/sounds/

start up:
- ui-wake_up_tune.wav to ui-wake_up_tune_no.wav
shut down:
- ui-shutdown.wav to ui-shutdown_no.wav
To confirm: (I hate this one )
- ui-confirmation_note.wav to ui-confirmation_note_no.wav
No. Your key tapping sound remains unchanged. This one only takes off the "Do you really want it?" follow with a loud PING!

or anything that annoys you

No. It does NOT affect any other operations/player except those call on to these files.
To reverse it, just change it back.

bun