In short, the API should be able to do everything one of the current exports can do.
I'm also using categories to inform various control conditions on our website, such as show 'notify me when available' instead of the default 'sorry-out of stock'.
A more feature rich API could be so powerful.
I'm surprised more people that voted for stock management at the option level haven't been pleading for this too.
stock sync between website and the inventory is a no brainer
Daily, manual product exports/imports to keep stock levels correct would really raise the bar for 1SC in stock management features
I'm adding duplicate items to my site to support different sizes and colors. Generally, my biggest complaint about 1SC is the stock management. I would also like to point out that the product export contains stock info, but the API does not; this would not be a big leap in coding but would make reinforce 1SC can manage stock.