Half damage is half damage.
Then it seems like Dual Wielding is a sucker's bet.
The upside is you can *potentially* kill 2 Kobolds a round
IF you have an 18 STR or DEX. 1d6+4/2 = 3.75 DMG on a hit. Getting to add 1d6/2 increases that to 5.5 Dmg to a single target. If you hit the same target with both attacks, you do 9.25 Dmg.
Compare to using the same weapon and just hitting once: 1d6+4 = 7.5 Dmg, adding Deadly Strike increases it to 11 Dmg. And this is not even the *correct* comparison, because since we are not using Dual Wielding, we are now using a bigger, more damaging weapon that does 1d8 or 1d10 damage per hit. Assuming 1d8 Dmg, we now do 1d8+4 = 8.5 Dmg + Deadly Strike = 12 Dmg. Assuming 1d10 it becomes 13 damage.
Also, if the 1d6/2 rounds down to 0 when you roll a 1, I could see many a fit being thrown at the game table.
Instead of half damage for each hit, maybe it should be -3 Dmg for each hit, or half, whichever is better.