In most emails you need at least two button styles – for the CTAs and for secondary actions like learn more/read some article etc.
Now it is possible to create only one button style in general settings. As a result every time when you create new emails you have to style secondary buttons completely from scratch.
Moreover, there is a bug that often makes secondary buttons inherit some properties from the General settings when sending email or previewing it instead of its own properties. Most often it is hover properties.
It would be great if you allow creating multiple button styles in general settings using a repeater button: By default every email has one button style. But you can click "+" and create more. Each button will have it's own CSS class and will not inherit anything from other buttons. When you add a button to the page you can choose:
a) Choose one of the styles that you made in general settings
b) Set parameters manually for this button but make sure that it's hover state does not inherit properties but has its own style for it.