That's amazing, thanks! It was good you convinced me to write it, I've been a bit low on steemit posting lately, so it's good to get back on track.
As far as I understand it, Rudex is really focused on the Russian steemit twin, Golos and since they had the gateways for that it was really easy for them to add steem.
But the funny thing is that openledger does support golos, but not steem... Doesn't make sense to me.
And I agree with you about the per coin fee vs, per transaction. That's what makes bitshares so amazing, you could exchange millions and still pay less than one cent in fees.