-norepeat, -repeat
Option -norepeat disables X server key auto repeat when
VNC clients are connected and VNC keyboard input is not idle for more than 5 minutes. This works around a repeating keystrokes bug (triggered by long processing delays between key down and key up client events: either from large screen changes or high latency). Default: -norepeat
You can set the env. var. X11VNC_IDLE_TIMEOUT to the
number of idle seconds you want (5min = 300secs).
Note: your VNC viewer side will likely do autorepeating,
so this is no loss unless someone is simultaneously at the real X display.
Use "-norepeat N" to set how many times norepeat will
be reset if something else (e.g. X session manager) undoes it. The default is 2. Use a negative value for unlimited resets.