There is currently no way to insert multiple components or the same component several times at once.
For example in my current project i had to make a track with 15 rollers in. I had to insert this item 15 times which takes up a lot of time. I think it would be interesting if it would be possible to say for example add a counter which adds the item 15 times at once.
Reference: http://forums.autodesk.com/t5/design-validate-document/inserting-multiple-components-at-once/td-p/66...