Thus far we have intentionally chosen single track. We get a really diverse group of people from academia to industry, expert to novice, and established professionals to students just getting started. Our thesis has been that getting these people in the same room helps grow a strong vibrant community. I suspect that things that emerge from this (hearing talks you might not have otherwise gone to, interacting with other attendees who you might not have met, etc) result in more value to the community than getting more people up on the stage as speakers. That is some of the reasoning behind the current structure.
That being said, Compose has grown tremendously as a conference in ways that we never expected. With the addition of Melbourne :: Compose in Australia it is now an international family of conferences. So who knows where things will go from here. I certainly wouldn’t rule out the possibility of multiple tracks in the future.