With Alfie I occasionally give him a meal of half NatureDiet (wet food) and half kibble, but I do it randomly so that he doesn't come to expect it.
04callahans, I don't feed Alfie on JWB kibble, but I do give him their treats sometimes, the Mini Jacks. I keep them in a jar by the front door so that if someone knocks, I have something there to hand to "incentivise" him to sit and not rush out/jump up!