It's not "silly"...
Bioware did not envision crafting or the RP of that racial tradition when defining the mechanical nature of dwarves when they created NWN. An elf's racial tradition of archery has a real, mechanical benefit in the NWN OC and its expansions, whereas there is absolutely nothing for a dwarf to mine in the same set of modules.
So it makes perfect sense in the proper perspective.
I may be wrong, as I've not looked into this, but it may be problematic to try and do this with a base race (as opposed to a subrace). On top of that, any dwarves already in existence would not automatically gain the feat, and per precedent with other similar changes (like changing class skills for certain classes), we wouldn't be offering a retroactive feat change or character edit.
It's worth mentioning that Barbarians, Fighters, Rangers and Paladins get the necessary feat for free.
