Already been done by others. Ther are some samples on the forum So Ashley doesn't need to do this. Also dynamic lighting isn't really traditional for 2D games. Since it can be done without 3rd party plugins and it's not traditional. I don't see Ash needing to do this.
Hmmm... I was under the impression that C2 isn't meant to create just "traditional" 2D games. I thought that it is a platform that enables people -with little or no coding experience- to create their games, and it achieves that with its intuitive workflow, be it pre-made behaviors, or/and the "amazingly simple to program with" event system.
To my understanding, a dynamic lighting system can not be done without 3rd party plugins (you need the Canvas plugin) and it's by no means an easy task. The best examples that can be found on the forum are, of course, by R0J0hound (http://dl.dropbox.com/u/5426011/examples14/shadow_cast.capx and even more impressive https://dl.dropboxusercontent.com/u/5426011/examples19/mario_record_w_shadows.capx), and even he states that there isn't an easy way to do it.
Sorry to put it so bluntly, I mean no disrespect whatsoever, but your "not seeing a need for Ashley to do this", must come from your needs (or the lack of for that mater) and does not reflect the need of the rest of us who require more or different ways to express our creativity. For some developers, the Path Finding behavior (for example) might be obsolete, or even useless, that doesn't mean that Ashley shouldn't have had it within C2. You get my point.
If anyone is interested, the topics from which I took R0J0s examples are the following:
Dynamic shadows.. now possible? https://www.scirra.com/forum/dynamic-shadows-now-possible_t73305?&hilit=shadows+R0J0hound
[CAPX] Yet another shadow caster https://www.scirra.com/forum/viewtopic.php?f=148&t=88188&p=699283&hilit=shadows+R0J0hound#p699283