I already use the time slot function (using local Boinc Manager preferences) to give a couple of other background programs a chance to do their thing, but hadn\'t considered it for this. Probably not necessary, as with 5) actioned the temperature drops anyway.
Interesting point about exiting Boinc before changing preferences. I hadn\'t realised until now that changing preferences stopped/suspended the tasks while the new change is actioned. As I allow \"leave applications in memory\" (in the local preferences) hopefully things continue where they were suspended. But there is no real way of knowing if local rather than global (web)preferences are in use, other than spotting the \"Reading preferences overide file\" line in the messages. Perhaps the nice BOINC people could put an indicator on the local preferences screen to show whether or not it is active.
Now the crucial question is, are some preference changes more volitile than others? So far I\'ve not screwed the model by making local preference changes, but they have only been things like time of day and allowing computing while computer in use. Reading between the lines of your reply, changing to only one processor may be a bit more problematical, but that said, there is no BOINC guidance on this that I can find.
So if I use local preferences to set the processor, I can only suspend the tasks not quit the process completely. To be safe I could stop and use the Global preferences, but if I had a multi PC setup, could I use the local preferences for this change? Recent backups are assumed in both cases.