sorry, first comand should be: devel-su /sbin/stop apps/n9-button-monitor and then run the second command like you did, configure it to skip songs while locked, start a multi-song playlist/album/thing in the mediaplayer, and then try to skip a song while locked a few times. im hoping it doesnt print aegis errors.
# /sbin/stop apps/N9_button_monitor.py stop: Unknown job: apps/N9_button_monitor.py ~ #
$ /opt/n9-button-monitor/n9-button-monitor.py /home/user/.config/n9-button-monitor.ini 121 881a4 29999 29999 b303 3973 1 0 0 1335852756 1335852756 1335852756 4096 refreshing config torch on libomap3camd 1.133 Staring camera without viewfinder available libomap3camd 1.133 auto shut-off torch off /home/user/.config/n9-button-monitor.ini 121 881a4 29999 29999 b303 3973 1 0 0 1335852756 1335852756 1335852756 4096 3: longClickStart /home/user/.config/n9-button-monitor.ini 121 881a4 29999 29999 b303 3973 1 0 0 1335852756 1335852756 1335852756 4096 3: longClickStop /home/user/.config/n9-button-monitor.ini 121 881a4 29999 29999 b303 3973 1 0 0 1335852756 1335852756 1335852756 4096 3: longClickStart /home/user/.config/n9-button-monitor.ini 121 881a4 29999 29999 b303 3973 1 0 0 1335852756 1335852756 1335852756 4096 3: longClickStop /home/user/.config/n9-button-monitor.ini 121 881a4 29999 29999 b303 3973 1 0 0 1335852756 1335852756 1335852756 4096 3: longClickStart /home/user/.config/n9-button-monitor.ini 121 881a4 29999 29999 b303 3973 1 0 0 1335852756 1335852756 1335852756 4096 3: longClickStop /home/user/.config/n9-button-monitor.ini 121 881a4 29999 29999 b303 3973 1 0 0 1335852756 1335852756 1335852756 4096