We worked hard to bring you a new HUGE feature in the Playground. You can now discover/learn new API and functions parameters while you're typing: Feel free to relay it:D
Here's a Tern JSON definition file for babylonjs http://hugos.site/babylonjs.json
(generated from www.babylonjs.com/babylon.max.js) , (a few "Invalid !type spec" errors were fixed by changing the "!type" of about 10 things to "fn()")
("it's not 100% functioning properly)