You can put a Shael in the mainhand Doombringer and it will work for both. I suppose you could add an IAS jewel to your Armor if you are using Arcaines or Skullders, and use a 10 IAS belt, but then you can’t upgrade to a Fortitude later, or will have to get an Andys too.
As stated, the Gist of the guide is this: 75% IAS, and level 27 Frenzy for fastest breakpoint. Following that; use the life on the swords to go low Vit. Have 3500 after BO, and put the rest in strength for extra damage. Go max resist and high lifeleech, hit things to live.
Put 1 point in sword mastery, so you have more points to put into Frenzy Synergy. Max Frenzy, BO, Double Swing and Taunt, put any further points into sword mastery after taking the one hit wonders in Mastery. This requires you to be able to get Attack rating from other places, which the swords will help you with. You can also get a Demon Limb for level 23 Enchant and a big AR boost. If you can pull it off it will be highest damage build.
Gore Riders are better Damage than WTs especially in 8 player games. The build is essentially lacking crushing blow, which as I say will have you choose your targets in 8 Player games. Gore Riders, Crushing Blow Gloves, and a Duress Armor will bring you up to par. But running Skullders and WT, allows you a decent MF.
I can sell you 2 above average swords for a Mal rune.