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BY FAR the easiest solution I have found is use IBP forum module and use it's registration/login side.
Let's face it, getting a person to sign up on your site is a feat in itself. Add the hoops for the firewall and say buh-bye to a new user. I've always thought this was a huge drawback of XOOPS (IMO).
After they are in and getting the feel of everything, then you can walk them through the XOOPS side and convenience them it's not a bad thing to set it trusted. (how many of us have heard that one?)
Dispelling the Mystical belief of Web Standards and tableless CSS.
Nobody gets excited about the tools used to build a house, people get excited about how the house looks and performs