qemu has a 'boot menu' feature which you can enable in virt-manager, which purportedly lets you select a boot device by pressing f12 shortly after startup. For me, the 'press f12' prompt shows, and if I hit f12 I get a menu, but it seems to ignore whatever choice I make. Specifically, if I have a VM with two hard disks, both bootable, and I hit f12 and select the second hard disk, it still boots from the first.
This package has changed ownership in the Fedora Package Database. Reassigning to the new owner of this component.
This might actually be a virt-manager defect, not actually marking both disks as bootable. Will need to confirm
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This seems to work fine for me on F18, so closing as WORKSFORME. Adam, please reopen if you still have issues, there's a few variables here.
Haven't checked recently, when the need arises again, we'll find out :)