Maybe in addition to integration and generalisation, reliable code
   maintenance could be something I could practice, too.
   A great example for that would be the android pull request I have open
   for libusb. It badly needs a maintainer as more people use it, and it
   doesn't have its changes ported forward as the main tree progresses.
   One challenge when maintaining from limited capacity, is how much
   feature addition and refactoring to do. The primarily challenge is
   defending stability of the software without compromise.