1 I think I saw another thread about it but closed the window by accident. On the catalog page or where ever a product list is displayed, products that have attributes should show those options above the buy now button or at least have the button say Select Options and products with no attributes can just shows Buy Now button.
2 I had this module written for PS but there are a couple bugs in it and I didn't bother to get the dev to fit them. https://www.prestashop.com/forums/topic/536132-free-module-ps-1615-combinationattribute-option-dimensions/#entry2470156 Since I paid for the code if its usable go ahead and use it.
Bascially what the modules does is each combination/attribute option can have weight and dimensions fields which are then available to the shipping modules. The reason I need this is because Canada Post gives much better rate quote when an item has dimensions and weight. For example say I sell a product that comes in 500ml, 1L and 4L bottle sizes. Obviously each option of the product will have different dimensions and weight.
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