Short answer: No. Long answer: You should read the paper on our web site under Mediational Modeling:
Muthén, B. (2011). Applications of causally defined direct and indirect effects in mediation analysis using SEM in Mplus.
The paper shows that there is a paradigm shift going on in mediational modeling with categorical outcomes and many SEMers are not sufficiently aware of this. The good news is that it can be done in Mplus as the paper's scripts show.