Would you not be better waiting for a beta. Gossamer Forum is only really in it's alpha stage so there are likely to be many changes and alterations so it may be a little early.
The forum uses a plugin system also that will allow you to create plugins straight from the admin page so it may be better doing it that way rather than making external authentication scripts.
The forum uses a plugin system also that will allow you to create plugins straight from the admin page so it may be better doing it that way rather than making external authentication scripts.