I would also request:
Ability to set up h5 and h6 without having to use CSS and markdown.
Ability to set up more colours and buttons, and apply hover effects without code.
Ability to disable the /cart page if you're on a business plan but don't do e-commerce.
Streamlined Squarespace's CSS/JS files, and/or the ability to disable stuff we don't use (i.e. disabling js loads for recaptcha and the Roboto font if we're not using them at all).
Please please please add viewpoints for tablets. The current set up is not truly "responsive" as it is.