Stopping creation of Aliases by default
No. Because Aliases are the preferred way of referencing an object, every time an object is mapped, an Alias is created. So, if you want to modify Aliases after mapping, that's a "step 2" in your mapping process.
That's the best approach, really. In my experience, while generally you don't need alot of those DIVs mapped, occasionally I've needed it to do some other detection or verification.
Modifying the Alias after the fact is relatively easy. Highlight the objects in the Alias tree, right click, and select "Exclude Items". This preserves the mapping for the identification engine but "telescopes" your Alias tree to something more manageable.