Would a be a big time saver to have as part of each element/row/section, separate margin and padding controls for desktop and mobile views. Similar to where you can control both a desktop and mobile text size as part of a single text element.

Often headlines and titles etc will look good in desktop view for spacing then when switching to mobile view usually there will be too much space above and below. To fix you have to create separate elements or rows and set each one to be viewed only with desktop and mobile views. When doing any future edits you have to maintain both views. If there were separate controls you could have one element/row and make the space show correctly across devices and only need to maintain one view.

Thanks!

Have the ability to fully customize the checkout element for mobile responsiveness. i.e. Padding, instead of showing product image and text horizontally - have it shown vertically, etc...