Trying to place multiple objects on the build platform in 15.06 is just a nightmare. I'm using Win8.1.
First of all, please don't automatically place every new object in the middle of the plate, forcing what's already there out of the way. Let me put it where I want it.
When duplicating an object, duplicate it in the same orientation as it's currently positioned in. Right now it duplicates and places the part in it's original orientation in the center of the platform, pushing anything that already occupies that space out of the way.
I've purposely had to move things off the platform to still have some control over them. But when i go to move them back onto the platform, as i click on it, it flies out of the window, refocuses the window, and then there is no way to move the object back onto the platform as the pick center of the object is nowhere near the center of the part anymore.
There has to be a way to remove all the history of the part's transformations while keeping them where they are. Barring that, there should be a numerical transformation display of each object, with the ability to punch in the numbers you want.