…..yes, I have this situation at home:
ZS working on an Alix 2D13 and dd wrt on a DIR300 wifi router; I tried to setup them with wds but ZS got freeze after few minutes ( maybe some bug in MadWifi drivers )…..also encryption was not good as only wep was working; then I decided to setup dd wrt as client bridge mode and ZS as AP station without wds enabled and it works greatly also with wpa2 encryption………not yet tried radius authentication