Werebat
Explorer
I'm also a proponent of "feature exchanges" rather than level-dip multiclassing.
If a player wants a single class feature from a different class... I'm always happy to swap out one of their regular class features they would have gotten for it instead. I find that much more elegant than making them multiclass and get a whole heap of features from the other class they might not have wanted, all to just get that single class feature.
So as [MENTION=6795602]FrogReaver[/MENTION] said above... swapping out 1d6 of Sneak Attack or Expertise or some other Rogue feature to get the Two-Weapon Fighting Style instead is my own personal feeling as the best way to go.
Oh... My powergaming players would salivate at the prospect of being allowed to do this...
What was that min/max saying? Ah, yes... "Yes, please!"