Standard
product_image_sizes:
This controls the resizing of product images. Each comma separated value represents a image resizing rule. The format is HeightxWidth,HeightxWidth, etc. For example, if this settings value is "50x50,100x0,0x200,300x400", then 4 images will be created: 1. 50 pixels high, 50 pixels wide 2. 100 pixels high, width will be scaled proportionately 3. Height scaled proportionately to a width of 200 pixels 4. 300 pixels high, 400 pixels wide
category_product_show_subcategories:

If set to yes, then all products in the selected category and all sub-categories of the selected category will be shown for the category page on the user side.
category_product_show_subcategories2:

If set to yes, then all products in the selected category and all sub-categories of the selected category will be shown for the category page on the user side.
order_items_per_page:

This controls how many orders are displayed on each page of the order list.