To add a resolution manually, you need to
-Exit VirtualBox
-Find the xml based "your-instance-name.vbox" file
-Open that file in a text editor
-Add an ExtraDataItem ... within the ExtraData section, for example looking like this:
ExtraDataItem name="CustomVideoMode1" value="1920x1080x32"
(As always the greater than and less than becomes all messed up, so add those too..)
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