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Crafting for a specific elemental damage is pointless. First, you can't craft higher than 40% in any damage type. Having a 40/60% weapon is not optimal against anything. Optimal is 100% damage and since the range of creatures that are vulnerable to any specific damage is too widespread, why bother.
I use Gold to craft all my weapons. It does 100% physical damage, which is just as useful as any other 100% damage type. It also gets the stackable luck and (not as useful) lower requirements.
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From the Blacksmithing forum FAQ, and verified by my personal experience (though I'm a returning player, so maybe this changed for some reason?) --
"*** -Damage conversion is where the damage % will be split into Physical, Fire, Cold, Poison and Energy. This creates your NEON possibilities. It has been shown that you can get a 100% Elemental attack percentage in ANY category using ANY runic hammer. "
EDIT: If you meant to say -ENHANCING- for a specific elemental damage, you might make a little bit of headway but for the fact that 40% of your damage targeted against the monster's weakest resist, or an even larger spread scattered against not-the-strongest resists (per Valorite) is a considerable amount of damage over multiple hits, especially with the huge DI% from a Slayer weapon or otherwise taken into account.
Also, again, if you were responding to me specifically I said in the same post that not all of my goals (read: none of them) are rooted in pure min-max ideology.