Ability to manually type in numbers in the number sliders: Sliders work okay, but it would be nice to enter the parameters using the keyboard so I can set the exact length of the password without wiggling the slider back and forth.
Support all characters in the exclude/include rule: Currently it does not support backslash.
Pronounceable passwords: Options to further scramble the words, like intentional misspelling or leetspeak, and salting the password with ocassional symbols.
Save the password generation rules to the vault entry, so that users won't have to adjust the rules every time.