i know Alblaka had ideas for a making a Building (lazer) Gun or Block launcher device. so here is my idea!.
a Rock-It Launcher, it would use cobblestone from your inventory and 1,000 EU's per shot to place a cobblestone block up to 64 blocks away (possible to lower the firing range and energy cost with modes) the internal battery would hold 60,000 EUs, just enough to fire alittle under a stack of cobble, but would also draw energy from Packs your wearing. this would make building structures significantly easier, especially bridges and circular structures. for a circular structure you could raise yourself up on a support column and then fire from aboveo the draw and build onto your Circular structure like Towers and Parapets. you could also use this to safely build bridges without the fear of your Shift Key glitching and causing you to fall into lava. of now about a better idea at to how this could work using Modes.
have the Mode Selection select a box on your HotBar 1-9. the selection would be indicated by a bright Red Square around the item. (be careful not to launch your launcher, lol) this would allow building with multiple, if not all, types of items currently in the game. even placing torches at long ranges(no i'm not asking for a moving lightsource). maybe have this Rock-it Launcher fire a blue beam that when it makes contant with a block then it places the selected HotBar item against the face the lazer impacted.
so what do ya'll think?