I tired to and set the Launch URI using the browse button, but it doesn't seem to be wired up. Also if I try and set a configured path relative to the project (bin/js/index-debug.html) it reports that "Please select a valid URI file".
Here is a sample of my .HXML file for more detail:
-main ClassCollector
-cp lib/collector
-neko bin/collector/ClassCollector.n
-cmd neko bin/collector/ClassCollector.n src/main/haxe examples/main/haxe/All.hx -class