What DOSType value shoud I use with PFS-2 ?

It is suggested that you use the following DOSType values for your PFS2 partitions :-

0x50465301    Normal version
0x50445300    Direct SCSI version

If you want to try a new version before putting it on all of your partitions change the last digit to a 9.

Note that changing the DOSType will cause HDToolBox to warn you that the contents of the partition will be lost.  This is not true.  A PFS-2 partition can have ANY DISType.  You can change them at will !