I don't think so. It would basically means that calibre needs to be able to read minds. For your example, it probably makes sense. But, if the I was searching for "aa", how does it know whether I want lowercase only rather than case insensitive.
For me, the ability to turn on or off the case sensitivity should be easier to get to. I am used to the search in the editor where there is a checkbox to enable a case sensitive search. The problem is that I can't see how to add this here. And I am not sure it is something that would be changed frequently enough to make it worthwhile. As this is the first time I can remember the subject coming up, maybe it isn't.
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