Stock collections

I like that despite extensive experience of brokerage, this broker not afraid to make some inovations. As an example, of course I name stock collections. I was interest in this type of asset and decided try trading them. To be honest, this pretty profitable way of trading since stocks that included in collections balance each other. It seemed to me that these collections move more smoothly than just stocks. But It's a pity that I can't create collections myself. I have few ideas.