2) At one point LeaseRig saved some settings for me and apparently GPU-threads was not specified or saved properly; the result was that when cgminer restarted with the updated config file, hash rates were about 10% lower (and could have been much worse on some PCs!) thanks to the incorrect threads setting, so make sure to include -g 1 (or -g 2 if that's what you want) in your cgminer options and not just in the conf file.
That happened to me, took me a while to understand why the rigs were running slower. Where do I include the -g 2 , you mean as the runtime argument ?
same question. Should it be in the shell file which I use to start or in the config? All my settings are in the config. Or is it actually best to not give restart privileges to the customer? Because in all honestly my rig never goes down (been stable 4 weeks without any issues), only a manual reboot once a week is what I do.