BTW what's the easy way to drop items from the inventory screem
Single item - Q (drop key)
Stack - Pick it up, move your mouse outside of the inventory screen, and let go
Everything - shift(sneak)+space(jump)+q(drop) - this will do the whole hotbar, if you do it on a hotbar item, or the rest of the inv (excluding hotbar) if you do it on items not in your inv.
The last will only work if you have inventory tweaks
There's also alt+Q to drop a full stack instead of just one item from it from InvTweaks. You don't have to grab and move it.
And NEI has shift+Q to drop all items of the same type. It works inside any containers, too, as in they will drop on the ground.