A lot more on calibration and RC checks. Needs more testing, but no known issues

ROMFS/px4fmu_common/init.d/rcS

@@ -182,6 +182,12 @@ fi
 # Try to get an USB console
 nshterm /dev/ttyACM0 &
 
+# Start any custom extensions that might be missing
+if [ -f /fs/microsd/etc/rc.local ]
+then
+	sh /fs/microsd/etc/rc.local
+fi
+
 # If none of the autostart scripts triggered, get a minimal setup
 if [ $MODE == autostart ]
 then