It shall be possible to manage some functionality of the rascsi process with SCSI commands. MODE SELECT/MODE SENSE could be used for that, with the RTC feature of #638 being the first implemnted mode page.
SCRA shall be the type of a new device that (via MODE SENSE and MODE SELECT) makes it possible to manage certain RaSCSI features or other functionality via SCSI commands. The combination of rascsi and the Pi effectively becomes a SCSI device of its own.

Besides RTC support (#638) a services device feature might be shutting down RaSCSI or the Pi with MODE SELECT.

The new INQUIRY product name shall be "Host Services". Client programs may use this product name and the "RaSCSI" vendor name to identify the specific processor device type. RaSCSI shall reject attempts to change these two INQUIRY data fields for this device type with the rascsi "-n" option.