1) Have daily bounties similar to the other vendors. This allows players to pick up more tokens. Ideal for those with not much time to play.
2) All of the initial weekly bounties all to reward powerful gear. Currently having only 2 that do this and the rest don't seems random more than anything. By having powerful gear as a reward for every bounty may push players that little bit more!
3) Extend Iron Banner from 1 week to 2. Plenty of time for people to get what they want from the event.