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You may also want to use live view when composing a shot of a sunspot for example, if using an ND4 (accidentally referred to as ND3 above) filter it might be a bit bright to look through your viewfinder. The Thousand Oaks 3+ filter I have lets through 10x the light of a typical white light ND5.
Other times live view may come into play in similar scenarios would be when photographing an eclipse while simultaneously visually observing. It would be disappointing to find a gradient in your images after the fact.
To get around the problem, all you need to do is switch out of live view once the scene is composed, but it would be nice if a firmware update would provide the option to do a "normal" shot automatically above say 1/1000 second. At those speeds you don't need mirror lock-up for anything other than lower noise.
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