There is somewhat of fine-tune in Forge...

I like spending a lot of time in forge making small maps to play with my friends locally. Despite all the time spent in Forge World in Reach (as as pathetic as this is), I never actually knew that clicking the left stick would go into a fine-tune mode. However, I had a different method because it was the only one I knew of, but it worked for me all the time. When holding onto an object, turn the camera so that you have a birds-eye-view of the object. I don’t know why, but when looking straight down at an object, the sticks become less responsive, thus giving a sort of fine-tune mode. I used this for years in Reach and it worked for me, and still works in Halo 4.