With this pacth the blocks can be moved to the center column over the sections area.
Using the same arrow icons on edit mode, if you move left a block that is currently at the right position then it will move to the center position.

Few modifications needed:

• /index.php
  /// aartiles: Added a center blocks position
  if (blocks_have_content($pageblocks, BLOCK_POS_CENTER) || $editing) { blocks_print_group($PAGE, $pageblocks, BLOCK_POS_CENTER); }

• /lib/blocklib.php
  //aartiles: New block position BLOCK_POS_CENTER
  define('BLOCK_POS_CENTER', 'c');

• /lib/pagelib.php
  //aartiles: Added new block position BLOCK_POS_CENTER
  function blocks_get_positions() { return array(BLOCK_POS_LEFT, BLOCK_POS_RIGHT, BLOCK_POS_CENTER); }

//aartiles: Changes done for complain with a center blocks position
function blocks_move_position(&$instance, $move) {
if($instance->position == BLOCK_POS_LEFT && $move == BLOCK_MOVE_RIGHT)

{ return BLOCK_POS_CENTER; } else if($instance->position == BLOCK_POS_CENTER && $move == BLOCK_MOVE_RIGHT) { return BLOCK_POS_RIGHT; } else if ($instance->position == BLOCK_POS_CENTER && $move == BLOCK_MOVE_LEFT) { return BLOCK_POS_LEFT; } else if ($instance->position == BLOCK_POS_RIGHT && $move == BLOCK_MOVE_LEFT) { return BLOCK_POS_CENTER; }

return $instance->position;
}