Yes they is away its called world edit it is an in game world editor and u can place multiple blocks at a time but it does requier a slight bit of getting use to and u may want to watch a few tutoriels befor getting stuck in, here it is.
World Edit for bukkit
http://forums.bukkit.org/threads/edit-sec-admn-worldedit-4-6-world-editing-de-griefing-1000.62/
World edit for single player
http://www.minecraftforum.net/topic/145023-17-00-worldedit-editcopypastetunnelsspheres/
