Standardize Element API requests
Here's what I came up with: https://gist.github.com/timkelty/8de8531df688b6ac08d2da0713b6ff00

This allows you to pass everything through request params, including specifying the transformer class.

Right now it looks for the transformer in the elementapi folder: plugins/elementapi/ElementApi_MyCustomThingTransformer.php

If a full-fledged CRUD API is baked into 3.0, I'm assuming this will be irrelevant by then.