Items

Stone Builder's Wand

Stick + Stick + Cobble = Stone Builder's Wand

Cheap and dirty wand. It

Can only place 5 blocks at a time
Can only place blocks horizontally
Can only place about 130 blocks in its lifetime.

Iron Builder's Wand

Stick + Stick + Iron = Iron Builder's Wand

A little bit better. It

Can place 9 blocks at a time
Can place vertially or horizontally (depending on its mode)
Can place about 250 blocks in its lifetime.

Diamond Builder's Wand

Stick + Stick + Iron = Diamond Builder's Wand

All the blocks.... for a limited time. It

Can place up to 1562 blocks at once.
Can place vertially and horizontally (several modes to choose from)
Can place 1562 blocks in its lifetime.

Unbreakable Builder's Wand

Stick + Stick + Nether Star = Unbreakable Builder's Wand

All the blocks ... all the time. It

Can place an inventory full of blocks at once
Can place vertially and horizontally (several modes to choose from)
Doesn't run out or break.

Modes

There are several modes the builder's wands can work in. The mode of the wand can be changed by the "Change Mode" keybind (defaults to 'M')

North-South - Extend north and south from initial block. No building on north/south face
North-South (+ Vertical) - Extend north, south, up and down from initial block. No building on north/south face
East-West - Extend east and west from the initial block. No building on east/west face
East-West (+ Vertical) - Extend east, west, up and down from the original block. No building on east/west face
Horizontal - Extend left and right from the original block. No building on top/bottom face.
Vertical - Extend up and down from the original block. No building on top/bottom face
No Lock - Extend left, right, up and down from the original block.

Mod compatibility

If you have Extra Utilities installed:

In order to get the unbreakable wand, instead of a nether star, you need to use an Extra Utilities Builder's Wand.
If you use the normal Builder's Wand in the recipe your wand will only do 64 blocks at a time. You can double that by crafting 2 wands together.
If you use the Super Builder's Wand in the recipe, your wand will be able to do the full number of blocks.

Modpack permission: Ask and don't receive - If you ask for permission to use this mod in any pack, you are not allowed to use it in any pack for 1 month. (Telling me that you are using it a pack is ok, but don't make it a question). Or, to put it another way: You are allowed to include this mod in any modpack. Please do not bother me with such questions

Screenshots