One quicker way to make a request is to post it to LW's Jira as a feature request: LW Jira instructions. The staff at LW appear more open to new feature suggestions this year compared to the past.
A parental control with a password is something that has been requested for many years. Some other gnutella programs have had a parental control. A filtering option password is an ideal way to go about this! Great idea (ie: applicable to any changes made to the options or the options for filtering.)