it would be useful of HDF5 files contained the full set of parameter values. This can be used by postprocessing scripts to find out eg about the symmetry conditions or some of the grid structure parameters as well as atmosphere settings.
IOUtil::out_save_parameters controls whether the full set of parameters or only those that have been steered are written to file (for regular output, checkpoints always write all parameters).
I would like to change the default so that all parameters are always written. If feasible I would even want to write all parameter changes to file (either as full parameter dumps for each output or as a full dump when the simulation starts then deltas afterwards).