1 page products list with cat/sub head directly selectable

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I'm looking at a feature I don't find here:
I would like a one page listing of all products, classified by catérogies and sub categories as headline titles (option : one page for one categorie) and on each line of the product I would like a checkbox and a combolist from 0 to 10 as quantity to put all the items checked with combo value different from 0 directly in the cart with one click on a single common button at the bottom of the page, without asking confirmation and returning back to the product listing with checkbox and combobox selected. Perhaps a popup windows could present the content of the cart.
Does any contributor have made such a feature in osCommerce ?
Many thanks if ideas could come here.