yes, all these are possible with AllWebMenus.
1. AllWebMenus supports multiple menus, you can use as many menus on the same blog as you like. You just need to create 3 separate AllWebMenus projects, one for each of your menus. Then, you specify that you have 3 menus by adding 2 extra menus in the "Settings" page of the Plugin. Each one will refer to a different menu project.
2. Concerning your question about the menu items, the 3rd menu should use the "Static" population method while the other 2 menus should use the "Dynamic" one. If you are not aware of what these methods are please read below:
The WordPress plugin supports 3 menu population methods:
- "Dynamic" population: The menu is populated with items dynamically (online), based on a WordPress menu. The AllWebMenus project is used to provide only the styling/behaviors of the menu; not its items.
- "Static" population: The menu is populated with items edited within AllWebMenus only. Any changes to your online website do not affect your menu items. So, AllWebMenus provides both the structure and the styling/behaviors of the menu.
- "Mixed" population: This is a mix of "Dynamic" and "Static". The menu is populated both with items edited within AllWebMenus and with items created online (through a WordPress menu).
3. For "sliding" submenus, you can choose the "Sliding" option at the related "Type" property of the AllWebMenus project and you will have a "sliding menu". The same applies for the "vertical" or "horizontal" type.
Let us know if you need any further help.