QNX 6.3 + VirtualBox + 1280x800 = ?

9.7 Advanced display configuration
9.7.1 Custom VESA resolutions
Apart from the standard VESA resolutions, the VirtualBox VESA BIOS allows you to add up to 16
custom video modes which will be reported to the guest operating system. When using Windows
guests with the VirtualBox Guest Additions, a custom graphics driver will be used instead of the
fallback VESA solution so this information does not apply.
   Additional video modes can be configured for each VM using the extra data facility. The extra
data key is called CustomVideoMode<x> with x being a number from 1 to 16. Please note that
modes will be read from 1 until either the following number is not defined or 16 is reached. The
following example adds a video mode that corresponds to the native display resolution of many
notebook computers:
VBoxManage setextradata "VM name" "CustomVideoMode1" "1400x1050x16"
   The VESA mode IDs for custom video modes start at 0x160. In order to use the above defined
custom video mode, the following command line has be supplied to Linux:
vga = 0x200 | 0x160
vga = 864
   For guest operating systems with VirtualBox Guest Additions, a custom video mode can be set
using the video mode hint feature.

9.7.2 Configuring the maximum resolution of guests when using the
         graphical frontend
When guest systems with the Guest Additions installed are started using the graphical frontend
(the normal VirtualBox application), they will not be allowed to use screen resolutions greater
than the host’s screen size unless the user manually resizes them by dragging the window, switch-
ing to full screen or seamless mode or sending a video mode hint using VBoxManage. This be-
havior is what most users will want, but if you have different needs, it is possible to change it by
issuing one of the following commands from the command line:
VBoxManage setextradata global GUI/MaxGuestResolution any
   will remove all limits on guest resolutions.
VBoxManage setextradata global GUI/MaxGuestResolution >width,height<
   manually specifies a maximum resolution.
VBoxManage setextradata global GUI/MaxGuestResolution auto
   restores the default settings. Note that these settings apply globally to all guest systems, not
just to a single machine.