We require a bug fix on our magento product list page, currently the system wont react to the order options on the list page (except alphabetical) we need it to list products by price order (and they need to be able to reverse this) as per magento's default settings. NO changes have been made to the productCollection functions.

We also require the ability to display a list of products that contain one of a list of comma separated values from the back end, using the advanced search url.

e.g. on the backend the product has a field called 'tags' (textarea) with the values 'tag1, tag12, tag15' if we request the url '/catalogsearch/advanced/?tags=tag1' will show all products with this tag, or if we request '/catalogsearch/advanced/?tags[0]=tag1&tags=[1]=tag12' it will show all products with EITHER tag1 or tag12

These changes will be applied to a heavily front-end modified version of magento, with only a few tweaks to core files.

Magento Version: 1.3.2.4
Timeline: ASAP