[rbp] Default extract thumbnails to false

It can take 80 seconds for a single file on a Pi. It can cause crashes with out-of-memory errors.
It genereates a lot of support issues. Best to default to disabled and let users enable it if they must
fixed: don't try to stick a value > 255 in a byte
Increase double tap timeout to 300ms
prevent bus rescan on a Pi, since the adapter cannot be removed