Is there an option to have sub-menus not auto-close?

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When the mouse leaves the sub-menu (e.g. by accident) the sub-menu automatically closes. Is there a way to prevent this?

I've seen that I can add a subMenuCloseDelay, but if I increase this then when the user switches between submenus, the previous submenu doesn't close.

Effectively I only want submenus to close when you choose a different submenu. Is this possible?