We're now running a basic spider-friendly URL hack here at UBBDev, without needing mod_rewrite. If it works well for the next day or so, it will be released.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.