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Along the side of our Paved driveway we have a gravel edging before the grass hits.. Weeds like to poke through this gravel from time to time and after years of digging em out we have gone with rock salt..
the weeds die.. and the lawn not more then a few inches away doesn't suffer (gravel's main purpose was for water drainage after all)
IMO your only worry is tree roots. living in canada i've seen what salt can do to a tree that was planted too close to the road.
as for the salt harming stuff.. the government dumps literally thousands of tonnes of it every winter on our highways.. a few studies have been done.. nothing conclusive .. at least that i've read. but in the concentration you're talking about it won't hurt anything.. cept for the aforementioned wandering slugs. heh
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