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

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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 ?)