Currently ebuild of scponly has --enable-chrooted-binary option in configure stage. But it is more desirable to have USE flag named e.g. "chroot" so user can choose preffered type of binary. Chrooted binary is not always required and sometimes it is some kind of obstacle when you don't want to create chrooted environment. Reproducible: Always Steps to Reproduce:
Why do you need this as a flag? Noone's forcing you to use the chrooted binary, set the user's shell to /usr/bin/scponly instead of /usr/local/bin/scponlyc and you are done.
OK, sorry, I missed non-chroot binary in /usr/bin/