4. The method of claim 1 , further comprising acts of: when a high likelihood of confusion is determined by the safety analysis, presenting a warning message to the user that the proposed voice command is likely to be confused with a different voice command; and permitting the user to retain the proposed voice command as a new voice command recognized by the voice-enabled system.
5. The method of claim 4 , further comprising acts of: requiring the user to preface the new voice command with a keyword when invoking the new voice command; and allowing other user-defined commands that do not have a high likelihood of confusion as determined by the safety analysis to be invoked without being prefaced with a keyword.