#1) First-level Only Feats
the Strongheart Halflings can get two... and then just take Luck of Heroes later on... thus, comming out ahead.
First-level Only Feats definatly brought more flavor back to playing a human.
However... help prevent Stronghearts from out doing the Lightfoots by NOT allowing their "racial" bonus feat to be a First-level Only Feat.
#2) PrC Prerequisites
Strongheart Halflings can meet PrC Prerequisites faster than the Lightfoots, and take Luck of Heros later on if they so desire.
#3) Luck Bonuses
Luck of Heros provides a luck bonus.
I am not sure whether or not this stacks with the bonuses provided with having a Luck Stone. If they do not stack, the Strongheart halfling can magically obtain the same benefits of the feat.
However, I would let the bonus... that the Lightfoots get and the Luck of Heros feat provides... stack with any magical Luck bonuses.
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As for qualifying for regional feats not from your original region..
By taking 2 ranks in Knowledge (local) for a specific area, you may take the feats specific to that region.
**Thus, I think that Knowledge (local) should be available to all classes as a class skill. ( i.e. The warrior traveled to the far away land. After earning their trust and respect, he was taught a few of thier closely guarded fighting techniques. )