We have major improvements coming in this area. In the meantime have you tried using Collections? Your customers can create a free Visitors account, create a cllection and send you the link. You will then have the collection as a reference. Here are instructions you can provide your clients with:
Creating a Visitor's Collection:
1. Navigate until you are looking at a photo page with the
photograph you would like to add to new collection.
2. Move your mouse over the image, a new menu will appear on
the left side
3. Select Add to Collection from the menu. A pop-up window
will appear titled About Collections.
4. Click Continue. You will be directed to a
Registration/Login page.
5. Under Registration select Continue
6. Enter a user name, your e-mail address and a password.
This information is necessary to create orders and will not be used in any
other way.
7. Click Continue. Once you have created your visitor account
you can return to adding photos to your collection.
8. Select Return to Photos and you will be directed back to
the gallery
9. Follow steps 1-3 until you have added all of the photos
you would like.
10. A confirmation message will appear each time you add a
photo letting you know the operation succeeded. You can now click View in the
confirmation meassage to view the collection.
11. To send the collection to someone simply click Send Link
at the top, right of the page. You can either cut and paste the link or select
Open in Email use your default mail program.