In 2 other engines I've worked with they use Ctrl+D as in duplicate and Ctrl+C as in copy. This key combo creates the copy exactly in the same position as the original. Then you just drag the new copy wherever you want. Might be something worth considering for GG.
System Specs: OS - Windows 7 Home Premium 64-bit SP1, CPU - AMD Phenom II X4 945, 3.0Ghz, RAM - 8Gb DDR3, GFX Card - 2048MB NVIDIA GeForce GT 640, FPSC-R Version - Beta 1.0085