That'll be much better. If you really want to see them go crazy, just put in a fruit they haven't had in a while.
Sometimes, though, I see individual roaches with stringy or extra-moist frass. Chronic issues with it are usually indicative of a husbandry problem, I've seen it when the habitat is kept too wet before. Isolated cases of it just seem to happen, though, and do not seem to pose a threat to their health. I bet it's uncomfortable, though!