Unfortunately sg_sat_set_features doesn't work:

galahad:~/sg3_utils-1.33/src# ./sg_sat_set_features -vvv --feature=0bh --lba=0 /dev/hdc
open /dev/hdc with flags=0x4002
    ATA pass through (16) cdb: 85 06 0c 00 0b 00 00 00 00 00 00 00 00 00 ef 00
ioctl(SG_IO) failed: Invalid argument (errno=22)
      duration=0 ms
ATA pass through (16): os error: Invalid argument
ATA pass through (16) failed

This is probably a kernel limitation. CONFIG_IDE_TASK_IOCTL isn't supported either:

galahad:~/hdparm-9.38-wrv# ./hdparm --verbose --read-sector 0 /dev/hdc

/dev/hdc:
reading sector 0: oflags.lob_all=0x3f, flags={ nsect lbal lbam lbah dev command }
oflags.hob_all=0x00, flags={ }
outgoing cdb:  85 08 0e 00 00 00 01 00 00 00 00 00 00 e0 20 00
ioctl(fd,SG_IO): Invalid argument
trying legacy HDIO_DRIVE_TASKFILE
rc=-1, errno=22, returned ATA registers:  er=00 st=20
The running kernel lacks CONFIG_IDE_TASK_IOCTL support for this device.
FAILED: Invalid argument

Getting and setting AAM works like a charm though:

galahad:~/hdparm-9.38-wrv# ./hdparm --verbose -M /dev/hdc

/dev/hdc:
outgoing cdb:  85 08 0e 00 00 00 01 00 00 00 00 00 00 40 ec 00
ioctl(fd,SG_IO): Invalid argument
Trying legacy HDIO_DRIVE_CMD
 acoustic      = 254 (128=quiet ... 254=fast)
galahad:~/hdparm-9.38-wrv# ./hdparm --verbose -M 128 /dev/hdc

/dev/hdc:
 setting acoustic management to 128
outgoing cdb:  85 06 20 00 42 00 80 00 00 00 00 00 00 40 ef 00
ioctl(fd,SG_IO): Invalid argument
Trying legacy HDIO_DRIVE_CMD
outgoing cdb:  85 08 0e 00 00 00 01 00 00 00 00 00 00 40 ec 00
ioctl(fd,SG_IO): Invalid argument
Trying legacy HDIO_DRIVE_CMD
 acoustic      = 128 (128=quiet ... 254=fast)

Reading the current WRV value as well:

galahad:~/hdparm-9.38-wrv# ./hdparm --verbose -R /dev/hdc

/dev/hdc:
outgoing cdb:  85 08 0e 00 00 00 01 00 00 00 00 00 00 40 ec 00
ioctl(fd,SG_IO): Invalid argument
Trying legacy HDIO_DRIVE_CMD
 write-read-verify =  0

Setting it to zero works OK, but doesn't enable WRV:

galahad:~/hdparm-9.38-wrv# ./hdparm --verbose -I /dev/hdc
...
	   *	64-bit World wide name
	    	Write-Read-Verify feature set
	   *	WRITE_UNCORRECTABLE_EXT command
...
galahad:~/hdparm-9.38-wrv# ./hdparm --verbose -R 0 /dev/hdc

/dev/hdc:
 setting write-read-verify to 0
outgoing cdb:  85 06 20 00 8b 00 00 00 00 00 00 00 00 40 ef 00
ioctl(fd,SG_IO): Invalid argument
Trying legacy HDIO_DRIVE_CMD
outgoing cdb:  85 08 0e 00 00 00 01 00 00 00 00 00 00 40 ec 00
ioctl(fd,SG_IO): Invalid argument
Trying legacy HDIO_DRIVE_CMD
 write-read-verify =  0
galahad:~/hdparm-9.38-wrv# ./hdparm --verbose -I /dev/hdc
...
	   *	64-bit World wide name
	    	Write-Read-Verify feature set
	   *	WRITE_UNCORRECTABLE_EXT command
...

Interestingly enough the CDB here differs from the one sg_sat_set_features tries to issue. Is -R 0 supposted to set Mode 0 (which is what I want) or disable WRV?
Setting WRV to 1, 2 or 3 fails:

galahad:~/hdparm-9.38-wrv# ./hdparm --verbose -R 1 /dev/hdc

/dev/hdc:
 setting write-read-verify to 1
outgoing cdb:  85 06 20 00 0b 00 01 00 00 00 00 00 00 40 ef 00
ioctl(fd,SG_IO): Invalid argument
Trying legacy HDIO_DRIVE_CMD
 HDIO_DRIVE_CMD:WRV failed: Input/output error
outgoing cdb:  85 08 0e 00 00 00 01 00 00 00 00 00 00 40 ec 00
ioctl(fd,SG_IO): Invalid argument
Trying legacy HDIO_DRIVE_CMD
 write-read-verify =  0
galahad:~/hdparm-9.38-wrv# ./hdparm --verbose -R 2 /dev/hdc

/dev/hdc:
 setting write-read-verify to 2
outgoing cdb:  85 06 20 00 0b 00 02 00 00 00 00 00 00 40 ef 00
ioctl(fd,SG_IO): Invalid argument
Trying legacy HDIO_DRIVE_CMD
 HDIO_DRIVE_CMD:WRV failed: Input/output error
outgoing cdb:  85 08 0e 00 00 00 01 00 00 00 00 00 00 40 ec 00
ioctl(fd,SG_IO): Invalid argument
Trying legacy HDIO_DRIVE_CMD
 write-read-verify =  0
galahad:~/hdparm-9.38-wrv# ./hdparm --verbose -R 3 /dev/hdc

/dev/hdc:
 setting write-read-verify to 3
outgoing cdb:  85 06 20 00 0b 00 03 00 00 00 00 00 00 40 ef 00
ioctl(fd,SG_IO): Invalid argument
Trying legacy HDIO_DRIVE_CMD
 HDIO_DRIVE_CMD:WRV failed: Input/output error
outgoing cdb:  85 08 0e 00 00 00 01 00 00 00 00 00 00 40 ec 00
ioctl(fd,SG_IO): Invalid argument
Trying legacy HDIO_DRIVE_CMD
 write-read-verify =  0

The drive does seem to receive the commands, but doesn't accept them:

galahad:~/hdparm-9.38-wrv# dmesg
...
hdc: drive_cmd: status=0x51 { DriveReady SeekComplete Error }
hdc: drive_cmd: error=0x04 { DriveStatusError }
ide: failed opcode was: 0xef