The wizard to create custom hwbot signatures has been made public today, as we received more and more requests from people to have a customized signature. You are now free to make as many signatures you want for yourself or your team.
You can make your own signature by logging in, options > signatures > create. Or you can make a copy of an existing one by logging in, options > signatures > choose and customize a signature you already like. If you encounter any bugs, please let us now.