Sure. Use Applications > Image Capture. In that app's preferences, you can set it to open by default when a camera is connected (which will apply to the iPhone as well; but if your digital cameras work directly with Lightroom, you may not want that).
Also, earlier posts stating that your iPhone photos are not backed up are incorrect - they are stored as part of the backup process when you sync (see
this kbase article). However, they are not accessible in that form, other than to be restored to your iPhone if necessary. Backing up is different than importing.
Hope this helps...