I'm a little confused.. what's wrong with just using the regex switch? it seems to me like the conversion between wildcard and regex is trivial enough that it shouldn't really matter. IMO if there's already a reasonable way to achieve case sensitive searching that *works*, there's no real need to add another.
FWIW: a wildcard "*" becomes ".*", "?" becomes ".?" and "&" becomes "\S+" when translating to regex.
