Could you elaborate on grouping? In my map for instance, I select all of my stair wedge's, then how do I "drag them" to the parent object? I think there should definitely be a parent button that lets you click the objects, or even a right click menu.
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Scratch that, I dragged all the items in the scene menu and it seems to work.
This is an awkward way of grouping thinks in my opinion. But I suppose it works.
Also, Control + L for texture lock, Is not doing anything for me. Duplicated prefabs start with good textures, then I move and its all borked. Again, there is no button for this action? Or even a drop down menu?