When voting for the idea please let us know which LC version you need this feature for: the stand-alone version, or the Drupal-integrated one.

Integrar Lite Commerce con mercadopago

selling a single product (a book, for example), and present everything on the home page, including the ability to add the product to the cart right there.

This is from shopify feature:
http://wiki.shopify.com/Selling_a_Single_Product_on_the_Homepage

Need to give admin control of how (default) product data is displayed when customers browse catagories and same for search results. Then also let the customer change this sorting on the fly in the customer zone. Search results should also group results by catagory.

a colorpicker for the litecommerce theme to change all the colors :)

Ability to upload several files or images at once in the sections where it is needed (for example, product gallery or files section) in the admin interface

have the default search functionality search the product pages and any static/informational/help pages, then distinguish between the two typws of results in the search output.

Split long drop-down menus into multiple columns to make them visible without scrolling the page