Mantis Bug Tracker - Forums

I am thinking this is not possible, but what I want to do is to add a custom dropdown menu to the navigation, similar to the Jump to issue which is part of Mantis. I know I can add a link with $g_main_menu_custom_options and have done so, but I can't find a way to add a list of items. Is this possible? If so, how can it be done?

There is no customization option for it.
You would have to write a plugin for this functionality.