IB also won't let you open various account types, if you put your experience down as (i believe the wording is) minimal, or whatever the lowest setting choice is.
i manage several accounts as an account advisor, as well as 3 of my own accounts via IB and I like the way they operate.
the point is that they are a discount broker who won't hold your hands, etc.
and they are (reasonably) taking these measures to cover their arses.
basically, you are saying in your app that you can cover your losses, and have the experience to trade with margin and without broker input, even w/o margin
also note that if you are trading leveraged instruments, you can lose MORE than your accoutn value, and IB will come after your assets. as they should, like any broker