I have one account where I can add items directly to custom lists from the item listing, and one account where I cannot. The option to "add to list" does not include any custom lists in that account.
Other than the ages of the accounts, I do not know what is different between them.
Effectively, one account can use Custom Lists, and one cannot.
Now eBay has removed the drop down on the item listing that allows the item to be save to my custom watch lists and the only way to do it now is a tedious "save to custom list" of select items and then delete them from the main watch list.
Beware: removing an item from your Watch List will simultaneously remove that item from all your custom lists as well. If you want the item to remain on the custom list, you must leave it on the Watch List as well. The Watch List can accommodate many more items than other lists can, at least.
