By the way, I think being able to specify your own character set is just brilliant. It is an extra layer of security above and beyond the master password. If you want to, you can repeat some of the characters to increase the chances they'll be used (punctuation marks, for example), though of course there's really no need to.
I think Leet Level is really not useful once you can specify a character set, though I guess it pretty much has to be there for backward compatibility at this point. Can the lower leet levels be folded into a predefined menu of character sets? I realize the top few levels actually insert additional characters, but the lowest ones just do substitutions, right?