I really love and enjoy the IntelliJ IDE and I have recently taken that to another level by exploring its platform SDK to build small security-centric static analysis tools (personal use for now, with the hope to release them to the community at some point). These tools should be able to run in an IDE and sometimes as command-line or headless tools independent of an IDE. I am not sure whether it is a priority for the community to help people like me building tools that leverage only a small subset of the IntelliJ SDK to do so easily. I understand that there may be other priorities, but there are gems in the SDK that could be used outside the IDE that are waiting to be discovered.
As I couldn't find recent versions of the SDK libraries in Central, I decided to contribute back a bit by building the platform as smaller components available on (Maven) Central. Ideally, this should be a community build, but I wanted to help myself and others who may have similar needs. Please find the GitHub repository here: https://github.com/adedayo/intellij-community . It contains a small build script added to the CE trunk and it has information on the coordinates of the libraries on Central.
I am happy to offer this back to be maintained as an official community build, or to continue to build major trunk versions. Please let me know your thoughts and preferences, but keep doing the great work you are doing on IntelliJ - I am happy to contribute in whichever way you feel is best :-)