Is there a way to hide certain items from the craft table?  There are plugins to "block" crafting them, but I don't want the player to be able to see that they can be crafted at all.  Is this possible or is it just a pipe dream?

Ui is client side, not possible to modify it through uMod plugins.

If its not the default blueprints, you can block their researching 

What about unlocking only certain items and locking the rest?  I see you can do it "per player" with the Blueprint Manager plugin, but not globally.