Tried out incorporating your scsi.device into my custom ROM, but my A1200 refuses to boot then. The ROM gets kicked via ACAtune but then my A1200 freezes.
Can it be due to this patch is missing:
SCSI4345p.readme ?
My A1200 setup with 4 GB CF-Card and 2 PFS3 partitions only boots with scsidev 43.45 or Cosmos 43.47.