Added a "pos1" pseudo block type, which uses the block type from the "primary position".

src/main/java/com/sk89q/worldedit/WorldEdit.java

@@ -404,6 +404,18 @@ public class WorldEdit {
                 return blockInHand;
             }
 
+            blockId = blockInHand.getId();
+            blockType = BlockType.fromID(blockId);
+            data = blockInHand.getData();
+        } else if ("pos1".equalsIgnoreCase(testID)) {
+            // Get the block type from the "primary position"
+            final LocalWorld world = player.getWorld();
+            final BlockVector primaryPosition = getSession(player).getRegionSelector(world).getPrimaryPosition();
+            final BaseBlock blockInHand = world.getBlock(primaryPosition);
+            if (blockInHand.getClass() != BaseBlock.class) {
+                return blockInHand;
+            }
+
             blockId = blockInHand.getId();
             blockType = BlockType.fromID(blockId);
             data = blockInHand.getData();