Customizing the Web IDE

I've downloaded the source for the web IDE and I would like to customize a few things. Specifically, I'm writing new Blockly blocks, so I would like to be able to:

1. Default to Blockly view as opposed to JavaScript
   
2. Have the blockly portion take up most or all of the screen by default.
   
3. I've added my new blocks to new list items like "Variables" or "Espruino". Is it possible to
   (a) get rid of these lists all together and just show all of the blocks available?, or
   (b) display only a subset of the list, then do something in the IDE to reveal more list items? The idea is to have a teacher "unlock" new blocks as a student passes a level with a subset of blocks.
   
   

Thanks,
Rehman