Choice List types can cause some issues in an identity management solution - see the troubleshooting information. It would therefore be helpful if the SharePoint Connector Configuration wizard could highlight fields that are marked as choice list fields (as simple as checking the ChoiceTypes enum of the attribute's PropertyInfo when retrieving the schema).
Moreover, if the choice list is marked as "Closed", the field could be marked as readonly in the schema - see http://msdn.microsoft.com/en-us/library/microsoft.office.server.userprofiles.choicetypes.aspx. This could also be done by default in order to prevent new choices from being added when the property is not set to "Open" - although this would prevent updates of the field to other valid options for the user. Some further investigation into appropriate behaviour in this case should be carried out.
Estimate includes familiarization with UI, formatting of the XSL, and testing.
Customer support service by UserEcho