I would like to create a new Runner that would load a random line from a CSV file on each iteration, and then run it just like the Web Page Runner does now. This is probably undocumented, but poss...
Ole has written a really good blog post about getting started with developing custom components, which you can read here.
We've also added some initial reference documentation (still in a very early stage) to writing custom components to our website, which is available here.