Homepages entered without "http://" on Comments rejected

I've installed Bad Behavior on a client's site. The client wants all users to be able to include their homepage in their comments. However, if a user just enters their domain without "http://", Bad Behavior rejects it with a warning that the homepage must be of the form "http://www.example.com"

Is there a way to control this restriction? I have not discovered a way to include a simple javascript check after the homepage field to add a "http://" if the user does not include one. Realistically, most users these days won't think to add "http://" since their browser does that automatically.

Any suggestions would be most appreciated. Thanks.