Just like it's possible to specify how much memory BOINC should use for both when the computer is in use and for when it's not, it would make sense to provide analogous options to limit the % or processors and GPUs when the computer is idle. This would allow finer control than doing no work at all when the computer is in use and would make more sense when multiprocessor systems are quite common and multiple GPU systems are not rare.

TIA

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We do have a whole new fresh Wish List thread for things like this. And then, it's been asked before and the developers have answered already, here.

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Genuinely thought this could be scripted using boinccmd or cc_config.xml by building a launch sequence to apply the changes to number of cores or % of cores permitted, and then on exiting for instance WOW to put it back to 100%, but there is not. It is possible to make multiple global_prefs_override.xmls, copy over and force BOINC to read it in with boinccmd

--read_global_prefs_override
Tell the core client to read the [PrefsOverride global_prefs_override.xml] file, and incorporate any global preferences indicated there.

Think that forces off a benchmark each time, but maybe not in the newest 6.12?

No, no benchmark yesterday when I used 75% of cores for a while with v6.12.15

Just one task preempted/resumed, the others continued unperturbed.