Good questions!
Im not gonna act like i know the answers...It will most likely not be a tab, but who knows how will SMT work in reality. I was also confused about the ICO being ETH based. Steem, throught SMT, is probably involved just with the airdrop and by "backing the VICE", but the actual fundraising is done through ETH (even though I dont know why)? I also thought that SMT will be the "smart contract" base, not the ETH... but i really have no clue:)