Just wondering if this is something missing or if I can't find the menu item.
In multitrack view, when you right click on a clip there used to be a "Duplicate clip" option that would then ask you how many times you wanted to duplicate it and insert that many clips end-to-end. I see a looping feature but that is a little different as it changes the mode to a looping clip (dragging the ends repeats the clip). I'm just looking for the old duplicate clip menu item which pasted the clip x number of times in a row.
This specific duplicate functionality has yet to be implemented. The closest method right now would be to Option-Click and Drag a clip to create a duplicate. If Snapping is enabled, the new clip should snap to the end of the original. This can be performed with multiple selected clips, as well.