Currently, customer can add as many products as s/he needed using default drag-n-drop functionality. Unfortunately, Ecwid doesn’t allow to change products quantity directly from products list. If you consider that this functionality should be added in Ecwid, please, vote for this idea here: http://ideas.ecwid.com/forums/22031-...
As regards product options, they can be selected from products list while product drag-n-drop to the cart. When customer drop products to the minicart small pop-up window, which ask to select product options, appears. In order to switch on this functionality you should go to Ecwid control panel --> System Settings --> General --> Cart - and choose “Ask customer to select the option” in “Adding products to cart without selected options” select box.
Maria Nikiforova, Ecwid Team
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