I think I found a bug.
Seems like the falloff options are not working in 2.3 Beta 3.
They work fine for Box, Circle and Polys, but for Lines they do not respond at all.
Oops, you're totally correct, there is a regression here.
I have a half dozen other bug fixes awaiting release, so I think I might bump out a new beta version within a couple days to address all of the ones found.