You should be able to specify 'mpiexec' as the app to launch and put the rest in the command line arguments field.Then, removempiexec from the modules of interest and add the mpi app as the module of interest.
Per the URL I listed earlier, you only need to view some local sampling data after starting the analyzer to workaround the SP2 problem. Just collect a default sampling run of 5 or 10 seconds in your project and always open the results after starting the analyzer. That's what I would do. :-}