Connor Wood at the Science on Religion blog thinks that yes, yes they are:
To put it simply, the mind’s causal stories tend to assume that whatever has happened in the past will determine what happens in the future. In the crisp realm of Newtonian physics, this is generally a good assumption. But in the unmanageably complex sphere of personal living, it is a bad one – particularly for a person trying to break a bad habit or learn a new way of doing something. By exposing ourselves to flatly impossible stories, we may be able to recalibrate our mental architecture to briefly challenge its own causal maps of reality – allowing us to make novel plans or take unexpected steps.