I don't think you should be talking about mods just yet here....
Also, if some of you don't know there are dozens of mods already available for the betas. You just need to search for them
Keep this in mind though, you don't have any support for your forum if you mod it, or use it in a live environment. Also, you might not be able to upgrade your forum in the future.
So please, just stick to phpBB2 and mod that for a while. Then once the RC1 is out, upgrade to that and receive support.
Do the smart thing!