Hello, thanks for opening this topic.
1. Nimble Builder does not include a gradient background editor for sections, columns or module. You can apply a gradient background by adding a few lines of custom CSS rules in the custom CSS setting of the current page options ( documented here ). You’ll find many gradient background CSS generator online, like this one : https://www.colorzilla.com/gradient-editor/
You can use the section id to target a specific section with your CSS rules. It would look like :
[data-sek-id="__nimble__9e0619c008a8"] {
background: #febbbb;
background: -moz-linear-gradient(top, #febbbb 0%, #fe9090 45%, #ff5c5c 100%);
background: -webkit-linear-gradient(top, #febbbb 0%,#fe9090 45%,#ff5c5c 100%);
background: linear-gradient(to bottom, #febbbb 0%,#fe9090 45%,#ff5c5c 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#febbbb', endColorstr='#ff5c5c',GradientType=0 );
}
2. Templates : yes, this is under active development and test at the moment. In the coming days, Nimble Builder will include a new set of features allowing users to save templates, and apply them for a page or make it the default template for all pages, posts, search page, 404 page, etc.
3. the menu module of NB uses the menus created with the built-in WordPress menu interface (on which you can create submenus)
4. No there’s no module to create vertical menu for the moment.
5. Yes. New modules are being prepared like a list module, a tab module. A pro version with additional features is also being currently tested, scheduled for April.