For those that are looking at this and couldn't find an answer try this:
- Go to your ~/Pictures folder
- Right-click (Ctrl-Click) on the iPhoto Library icon and choose Show Package Contents
- Scroll down to the Originals folder
- Right-click (Ctrl-Click) on the Originals folder and choose Make Alias
- Name it something (e.g. iPhoto Photo Link)
- Move this alias to your ~/Pictures folder
- Now go back to Lightroom in the Import screen, navigate to where you put that alias (e.g. ~/Pictures/iPhoto Photo Link)
You should now be able to import all of your iPhoto photos to Lightroom. Note this will not preserve events or any other iPhoto features, but it will allow you to see all of your photos in Lightroom without having to Export from iPhoto (which requires making a copy of every photo).
JK