We played with the Bag O' Bones as written. We didn't see the point in changing the halfling's ability of one reroll per encounter to one extra bone. The player of the character, fellow players and myself as gm felt it nerfed the Halfling's ability.
We recommend using the Bag O' Bones but drop the rule about the halfing getting an extra one and just play them (halflings) as is.
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I think that you have to definitely at least double the number of bones (i.e., to four) that a halfling gets to justify taking away the reroll per encounter ability.
Agree 100%
Halfling's are luck magnets!
And quite tasty in puddings.