no you cant...
but there is a device that let you boot directly an adf. It replaces the floppy drive and it is called HxC Floppy Emulator.
Yeah, this is what I use. It can be little cumbersome at first, but once you get it working it really rocks. It may seem a bit pricey, but it's really not when you consider what you're getting and how well it works.
http://hxc2001.free.fr/floppy_drive_emulator/The 3.5" drive version wasn't out when I bought mine... makes me want to upgrade.
-Chris
