Hi @Motta,
We have limited number of blocks on widgets as our themes are on the standard of WordPress theme review guidelines. We cannot allow maximum inputs which fall under content creation.
However, if you like more features than allowed on widget, you can repeat same widget twice. You will have 12 fields if you use those widgets twice. You can leave title field of 2nd widget empty.
If you need to reduce space between them, please provide us your site URL, we will help you to write custom CSS for it.
Thank you.