Unfortunately, I have to agree with darkdevil1. I think the number of Iron users is much fewer than the number of SlimBrowser, K-Meleon & Sleipner users.
And I notice the smiley face after the post about "If they're going to include Google Chrome it's only fair to include SRWare Iron". I assume that was meant to be a joking statement. The first 5 browsers in the ballot screen are the top 5 browsers in terms of usage (although shown in random order). Google Chrome is there because it has 5% worldwide usage.
Getting Iron browser included into the 12 browsers of the ballot screen will require a significant number of regular Iron users.