On this note it seems incredibly important to make sure the medium has something analogous to refactoring in code: ways to tranform the system into a better form in discrete, safe steps that do not change the behavior.
Version control, refactoring, code reuse, etc. are big items on the roadmap for the next release. We have some interesting ideas, including the realization that refactoring in this sort of system can take the form of graph rewrites.
