Be sure to check out Steve McCoy's response to all the teetotalling chatter: Biblical Liberty and Terrified Baptists.
Of course there is one, clear biblical warrant for this kind of thinking: the Pharisees. Yes, those "strong conservatives" knew how to take seriously all the "contextual and principle considerations" behind their extra-biblical rules. I'm sure their intentions were often good, desiring Scriptural fidelity and a "holy life." But they were condemned because they missed the grace that sets us free, opting rather for their own interpretations and additions to the Law.
Read it all at Reformissionary.