The Dark Sun Halflings are a cool take on the species (and have like nothing in common with the standard halflings except for their height). But they are actually very important to the history of Athas, and I don’t plan on having Halfling PCs for now. If a player truly wants to play one though, I will tackle it sooner rather than later.
As for the joy of building the lifepaths itself - it’d actually be one, because they have a unique culture different from the standard human/mul/half-giant etc. So yes, I do plan on getting to them eventually 