My 2 cent with an easy temporary solution
modified uc_i18n_sync.module (found here http://www.ubercart.org/contrib/8787)
added two more synchronization sql queries for uc_product_attributes and uc_product_options
solution is not completely automated since I don't know what function to override
(where to hook the attribute/option synch sql queries) does anybody know ?
Thus one has to edit/save the product in order for attributes/options to get synched across other translations
Maybe I missed the point of previous discussions but couldn't this be a workable solution for uberacart2/drupal6 ?
(Other ubercart/product variables can get synched the same way I assume right ?)