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Two possible checkboxs for search users:
1. case sensitive or not
2. search all pages with tiles contains this keyword
And I do not know it is a bug or not for this: I have both an article and a category 
named AAAA, but the rearch result is to directly jump to the article named 
AAAA,ignoring the fact that there is a category for it. I toggled on category in the 
search namespace when doing this.

1. There is no case-sensitive search and we are not likely to ever add it.

2. The regular search already does this, as you mention. Use "search" not "go" to avoid jumping directly to the exact title match, and 
you can select additional namespaces to search in.