Is it possible to set the iControl Session 'timeout' & 'maximum sessions' through the CLI?

One more thought. One can save_configuration using iControl (System::ConfigSync) and that could be made to save these settings, with the possible drawback that as currently done that would save everything else too. Not impossibly bad, if documented well, and as I understand that is how the tmsh preferences work (saved along with everything else, but only when you save sys config).