For Thunder Clap, if you don't need it to slow attack speed, you can use an ability based on the item abilities Rune of Speed or Scroll of Haste. Just set the speed bonus to a negative %. That way you only have to trigger the damage, which is really easy. Otherwise you'll have to create a second dummy ability based on Slow with as many levels.
For Shockwave just use Carrion Swarm instead. Make the start and end areas the same size and it'll function as normal line damage instead of a cone.