the problem with the wet rice is that it tends to pack up at the hopper and pusher block area due to its inability to flow into the combustion chamber as would dry coal. really its no big deal just an inconvience at the worst time.
sometimes running the stroke to max will work it out and push it through or it will just sit there and do nothing. if it doesnt work then dig out the hopper so you can see the pusher block and work dry coal into the opening until it feeds on its own.
i use plastic buckets with drain holes on the bottom and stack them around the side of the stoker to let the radient heat off the stove to help dry it.