Okay guys, MeddleAPI v1.0.6 is up. This isn't a critical update, you can still play 15w45a without it, but you won't get the main menu branding.
The reason why you'll probably want to upgrade to v1.0.6 however is that it includes a patch to force Minecraft to update the crafting recipe output to clients. This means server-side-only crafting recipes should work just fine from now on. I tried it with the Heavy Axe from a vanilla client and had no problems. If you see anything odd happen while crafting as a result though, let me know.
Mappings may not exist yet to make that work efficiently, but there may be someone willing to take up the challenge!
So i've thought about my suggestion of held torches emitting light, and maybe with the current mappings (i don't know anything about mods so hopefully i'm right about this) it would be possible by adding an invisible non-solid block with no hitbox named "itemlight" that emits light, that would be set inside the players head when a torch is held, and wich would automatically be destroyed when it's not inside a player holding a torch. Could that be possible?