I understand that the mdadm maintainer chose[1] not to include a patch for changing SCT values, but maybe md, lvm, btrfs and friends could be patched to simply check the SCT values and emit warnings through syslog or dmesg if they find SCT has not bee configured before a device is assembled or mounted?
1. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=780207
