And again one more idea:
If we keep the goal trying to implement some alphabetic selection…
I noticed that while playing a song one can keep the center botton pressed in order to add another song to playlist.
This input method (keeping center botton pressed) remain free in the artist selection. It could be used in order to activate the flick from letter to letter. The inconvenient might be then that one keep on waiting 2 second to actived it all the time. This issue could then be solved by a linked option in the properties menu in order to decide wether or not alphabetic selection should be always on when one enter the artist menu.
And right another one:
If some material restriction are making impossible to have locking fonction on the power button, you may consider the possibility to implement it when both volume botton are pressed together (the goal should be to transfert from the “too sensitive” pad to the 3 remaining botton the locking-unlocking fonction
