editing webform component of product attributes in submission doesn´t save to product´s database

This feature is probably not intended to be or to get involved:
my customers should be able to check and edit their submissions before (until) they finally complete the order.
And so they should be able to edit the attributes that are configured as webform components.
For now I got this workflow where customers see the link "View submitted data" next to each product in the cart (and checkout).
(edited uc_event_registration.module in line 329 and 308, switched permissions to "view own order").
With permission to "edit own submission" they can edit every product.
But when they edit components with attributes, the data gets only saved to the submission but not to the product in the cart.
For now I have a solution with the module uc_attributes_in_cart (works in cart and checkout) and edited uc_event_registration´s webform.inc, so that attributes don´t show up in submissions´view and edit screen.

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