I must say, I did not understand the motivation for that, as scoping is a subtopic of binding (though the word binding is often not used alone). Still, I believe the two concepts are not separable, and thus do not justify two tags in my opinion. Binding is a bit more general as it may includes for example discussion of the uses of binding for different purposes: quantification, abstraction, .... But binding always implies some scoping policy.
I would suggest keeping both as synonyms, as binding may be more naturally used by theoreticians, while scoping may be used more by programmers. Actually, my preferred choice would be name-binding.