I noticed, when selecting objects on the canvas, Construct 2 don't support add more objects while pressing Shift.
When you select a part of objects and want use the area selector holding shift to add more objects from another place, it clear the selected objects from the first selection.
I did a video to exemplify what I mean.
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Ohh, thanks newt , like on the video, the software's I have contact use Shift ^^
edited: it still missing the multiply selecting area, but help a lot xD
If you are holding control and then you click on an object and drag it away it will copy the selected object (Or objects if multiple are selected). Is this what you meant by multiplying Telles?