Well, less facetiously: if I can add in-language functions to the image, using the language facilities, while the deployed application is running/paused, I think of that as dynamic.

Data is an interesting thing. There's a crossover point between structured textual data that can be sucked in and when you want to start doing relational queries and stores. Then there's how data is handled in the program. The methods you describe above are very useful, but - insofar as I know of - I think they can be reimplemented without massive grief in other languages, depending on extensibility. Lua has a good reputation for speed; I take it you use it as a standalone?