There are entire cultures of boat humans on Earth, but I'm not sure if there are any on rivers. The concept seems workable.
Halfling-run riverboat casinos!
Halfling yokels telling you you've got a pretty mouth!
Halflings that speak some sort of pidgin French and eat spicy foods!
Halflings with a great tan who eat shrimp off the barbie! They surf and wrestle crocodiles!
Halflings in the sewers a la the Goonies!
Halflings on Chinese junks!
Halflings in a tropical paradise where they dance the hula and wear grass skirts!
Halflings of the Amazon Basin, with facepaint and jungle herbs and poisoned darts!
Pirate Halflings of the Spanish Main!
Hold on a tic....halflings already have good stealth....and now they're no boats!
OH NOES! Halflings killed ninjas, and then killed pirates, and took both of their stuffs! OH DEAR LORD THEIR PECIOUS STUFFS!
The rivers and waterways are a good piece of landscape for adventure and action, I just wish they helped one of their new races take the role rather than foist it on the Halflings. Admittedly, they were floundering for a type, but I'm not sure "rivers maybe?!" will stick.
PLUS, this means that there will be acquatic adventures right out the gate, but they've said they don't have cohesive swimming rules yet, so GOOD acquatic adventures might be hard to come by.
