It would be nice to add global CSS variables, so you use could these for any type of css settings.
For example: Set a global CSS variable and add these variable for any spacing, size, or for any other setting.
At the moment you could define classes (which is also fine to set custom "presets"), but what if you like to add many predefined spaces or sizings. You need to add many custom classes.
With variables you need to only specify the values.
Yes, at the moment it is possible with custom code and choose "custom" (spacing) and then add: var(--my-custom...). But it would be nice to have a selector like the classes panel!
These variables could also be responsive.
So the system should be very fluid.