sim create currently takes the --parfile option, and this parfile is used for every restart. Cactus allows parameters to change upon recovery - this is called parameter steering. SimFactory should allow this as well.
The obvious implementation is to allow a --parfile option to "sim submit" which uses the new parameter file in this and all subsequent restarts. This needs some code to be moved from restart.create to restart.submit regarding parameter file substitutions. We also need to decide what should happen to the copy of the parameter file stored in the top-level SIMFACTORY directory. Should it remain the same, or should it be updated with the new parameter file. Subsequent restarts should inherit the parameter file from the previous restart.