I'd say not rangers because as a race, they are not explorers and stay close to home. But, as thieves, they'd be able to hide like assassins in certain non-city environments.

I'd argue for higher dex than that. Sure, they have short limbs, but they're not stubby for their size and are natural thieves. Halflings have more fast twitch muscle than strength muscle IMHO. Also, too many thief skills are dex based to shortchange halflings this way.

I'd go 24dex 18con 18str 19int 22wis ~23cha+*

*I know they're not beautiful, but should be awesome bards, so should have very high charisma since it would be required to make that happen. Come to think of it, why do elves have such high charisma? They may be beautiful to look at, but most of their personalities are off-putting if you are not an elf.

Maybe healers. Agree with above avg wis and mental resist.

Would disagree with water vuln. They fish and garden too much for that. And don't come from mountains or underground.

They should be the most natural thieves and bards in the lands. This balances with their inability to join most cabals* (any cabals* if neutral/neutral).

*PK useful powers. They'd be right at home in Herald