I saw a suggestion where using /craft , you can automatically craft items if you have the necessary materials.
http://meepcraft.com/threads/craft-gets-an-upgrade.52587/
I was thinking, why not use /recipe instead?
Here's my suggestion:
1) Whenever you use /recipe, it takes the materials from your inventory (if you have it) and puts it where its supposed to go to craft a certain item. That way, the player knows what material is missing in order to craft a certain item because it would show 0 next to the material.
This, I think, would be much easier than having to do /recipe redstonecomparator then /craft redstonecomparator 64. Also easier to see which material is missing when there's a 0 next to it, compared to typing /craft redstonecomparator 64.... having an error message in chat saying "Cannot craft redstonecomparator.. missing stone".
2) The player can just click on the item or shift click to craft it into inventory.
Obviously this feature should probably be for the higher ranks so I wouldn't know what to suggest to separate the players who can use /recipe and actually craft, and those who can only use /recipe to view.
Anywho, just a suggestion!