Form follows function. A rule in architecture, that says.. the form of a building - its appearance, its design, follows the function it was intended for.
In Biology, Darwin said it similiarly, in two ways. A creature evolves to fill a niche; he additionally said a creature will grow until it outgrows its niche.
Which brings me to halflings.
Halflings as nomadic creatures exist merely to differentiate themselves from Tolkiens hobbits. And as such its believability is laughable.
Settling down - was a survival advantage. And nothing in the write up
suggests any reason while halfings would be anything other than mobile hors d'ouvres.
Contrarily, short stature suggests living in confined spaces. Living in close proximity with another race - suggests either the ability to escape notice, or the ability to be charismatic and affable neighbors.
Halflings are not notably fast. They have no racial abilities with mounts or nature skills such as nomadic peoples usually have.
On the other hand canon suggest they do love elaborate meals - something again that points to established food sources.
Halflings as farmers, as almost ne'eer seen helpers a la brownies - or thieves.. these are believable back stories for halflings.
Nomads is just brain dead. According to your design documents your challenge is 'to fix it'. Have at it!