We might need you to explain the issue more explicitly. The changes made to fix that previous bug report would have benefited any similar drag and drop system, including this one.
In other words, if the user field choices drag and drop still works as expected then it should be working fine here too as far as I can see.
The only alternative is you're hitting a different bug entirely hence we need more details about what is actually happening. If you can confirm the custom fields stuff is working, the specific device and browser/OS versions and an explanation as to exactly what is happening then that would be useful.