What would it take to be able to boot from >4BG devices

[Oldsmobile_Mike]

Do you really need a Workbench partition larger than 4GB?  IMHO just create your Workbench partition under 500MB or so to retain compatibility with older software. Then make your other partitions as large as you like (assuming the appropriate controller, file system, etc.).

[Oldsmobile_Mike]

Yes, this is usually how I use PFS on a drive.  I go to advance, add new file system type, select that which I want (usually in the L folder, if I remember right, like PFS-handler or similar), and hit OK.  I suppose, then, I am missing the DOSTYPE part?

0x50465303 for PFS3-AIO

I've had that stuck to a post-it note in front of my computer for years.