One of the challenges for me with InfraWorks has been the limited vegetation content. It seems to only have a huge variety of deciduous trees and only a couple of conifer trees. I understand it is possible to add content from other sources, but there is an unballanced selection of vegetation and a very limited selection of people that comes with InfraWorks.
My idea is to add more vegetation, people, and just more content in general to the out of the box content, so for quick modeling we have them quickly available vs. the effort involved in bringing in content from other sources.