Would it be possible to have absolute Colour Spaces (ST2084) reference level being set during measurements, as it happens for the relative (power gamma) ones?
I remember I have already asked you, but you answered no way, as ST2084 are absolute.
Please reconsider taking in account that, first I am not aware of 10000 Nits panels, and, as unless you have a very stable panel, each time you measure HDR/DV, your panel reference level changes, and, for being accurate, you need, each time, to create a new Colour Space. And the outcome is a proliferation of names, quite annoying and requiring also PC time machine when they are indexed by CS.

Please consider also to how many rec709 colours spaces each of us would have, if this feature were not available for Rec709 colour spaces

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I agree, it would be really useful. All these panels are different and you want to see how it tracks the eotf up to its limit, creating individual colourspace is painful.

With any relative colour EOTF space, the Min/Max luma values are irrelevant, and are not included within the target colour space.
Only the EOTF and Primary RGB, and white point target values are held within the colour space.
That makes the comparison of Absolute colour spaces with Relative invalid.
(You never save different Relative colour spaces with different Min/Max values)

Changing the Min/Max values with an Absolute colour space is the same as changing the EOTF, Primary RGB, or white point target values with a Relative colour space.
So the workflow is presently basically identical for both.

Any attempt to dynamically change the Min/Max luma target values of an Absolute colour space would mean a total recalculation of tone mapping, etc.
And that means you no longer know what you are actually targeting - as the colour space is Absolute.
That means you would likely have to save a new target colour space every time the min/max targets changed, so you could historically know what you were targeting...

So, not at all as simple as it may first seem.

Steve