All the times that i have to create a level with GG , the biggest problem is to correctly position objects that require the snap function. The only grid 1x1 or 100x100 inch is insufficient and obsolete . Moreover the user is obliged to create own model that must fit together perfectly in GG ( and trust me does not always happen even if the models follow the snap 100x100 inch rule)
That said... Please add very early Per vertex snap
The software I use? ... Autocad, sketchup, Spazio3D, pconplanner, Kerkythea, wings3d, paint.net, torque3d, AxixGameFactory, PD particles.......maybe blender