If you have NickelMenu installed, the install will add items in the .adds/nm directory to launch Plato and KOReader. You will have to remove the # from the front of the launch line to uncomment them in the koreader and plato files. I removed the kfmon, plato and koreader items from the nm directory and added the following two lines to my nm_config.txt.
Code:
menu_item : main : KOReader : cmd_spawn : quiet : exec /mnt/onboard/.adds/koreader/koreader.sh
menu_item : main : Plato : cmd_spawn : quiet : exec /mnt/onboard/.adds/plato/plato.sh