It would be really great if I could have API access to hud stuff. I would like to hide things like the health bar, sprint bar, hunger and thirst (I know Red you've said inventory hide show API will be really - which is awesome!). I would also like to change where the block id info is shown. I.e. not in the bottom left when using a block.
I would like to hide the 'default' game hud and replace it with a sever specific "themed" one.