Creating a really useful index is an artform, let alone one that has the
feature that you are after.
The trouble with probably all machine generated indexing functions, Word's
included, is that they list the page numbers of (virtually) occurences of
the indexed term and usually 99% of those occurences tell you no more about
the term than the index itself - the page number upon which it appears.
I didn't suggest that I was looking for something that would go
through a document and automatically select what to index. As you
suggest, that might not be a good thing to do.
But I am dumbfounded that once the writer of a document has indicated
which occurences of which words & phrases he wants to index, the
software that builds the index cannot do a slightly better job of it.
By that I mean instead of merely a dumb list of the index entries, it
should build the index with hyperlinks so it is easy to go to the word
on the page when a reader clicks on the page in the index that he
wants to see.
Is this really asking too much?
These hyperlinks are built automatically with the TOC; why is it so
hard to do with an INDEX?
With such a feature it would be extremely efficient to examine all
occurences listed in the index one by one until the "right" one is
found.