If the repeater clones his mac for all clients connected to it it can break things anyway. However I don't have a wrt54g to test anyway ;) but there were a lot of discussions at the m0n0 list concerning that device and problems with captive portal with several different firmwares. If you really want to shut that down you have to change your wireless setup to prevent this. The pfSense only can see a macadress and an IP. If something of this or even both is faked how should it tell which one is the original and which one is the fake? Your problem is a wireless authentication/association problem, not a pfSense problem or at least nothing that can be fixed/workaround from the pfSense side in this setup.
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