I just thought I'd suggest again the usefulness of a simple user option to obtain c.i.'s using multiple cores (like through snowfall). Could be bootstrapped, could be ML.
I'm routinely it seems running into problems with many parameters. Ideally I'd want c.i.'s on all of them, but computation proceeds too slowly for this to be feasible.
I'm sure you get this often, but OpenMx is fabulous. Longtime R and S users are most grateful.