[cg2112]

Here's a thought.
What if you were to use root beer extract and sugar (or some other fermentable) like you normally would, but then used some other non-fermentable sweetener, like lactose or Splenda? Is there any reason that this couldn't produce a decent tasting alcoholic root beer?

[mrrshotshot]

Not sure. I've muddled around with a root beer Brown ale recipe, but not alcoholic root beer. I'd be careful with splenda. I'm pretty sure artificial sweeteners like splenda giv you diarrhea in high enough quantities.

[Shooter]

It will make an alcoholic root beer. Whether it will be decent tasting is hard to say. Give it a try and see what happens.