I recently installed NIS 2011. I have set up custom scans such that each drive on my system is fully scanned on a different day. I am unable to find a way to set the priority of these custom scans -- I want to set the processing priority to low such that system resources are not taxed. There is an interactive dialogue when a particular scan runs, but it is not clear if that response is for that instance of the scan or is "remembered" for all future instances of that scan. I suspect that the priority setting is a single event because the NIS task scheduler is not modified.