Query string parameters not appended to existing parameters

Hi,
I installed your module to achieve a product search on this product page :
http://couture1.artstanding.be/product-grid-sidebar

First, there was an issue with the URL not setted properly (query parameters were added on frontpage url), which i solved by applying this patch :
https://www.drupal.org/node/1069966
Because my site also supports multicurrency with the aid of an added qs parameter ?currency=XXX , the autocomplete exposed filter does not work in combination with currency parameter.
You can find more details about this in this comment :
https://www.drupal.org/node/1069966#comment-10605122

So i am posting this issue both in Views issue thread as Views Autocomplete Filters issue thread since i'm not sure where it should be fixed.
My impression is inheren since querystring appending is working correctly on standard exposed filters.

Thanks upfront for any help that might lead to fix this!