This mod add setblock and place command
Commands
/setblock x y z modname:foobar_node & /place x y z modname:foobar_node
Place a block at x,y,z (setblock call minetest.set_node, and place call minetest.place_node)
/setblock_heremodname:foobar_node & /place_here modname:foobar_node
Place a block at your pos (setblock call minetest.set_node, and place call minetest.place_node)