TrustedUserCAKeys for ssh

[clarknova]

Our organisation normally uses the following lines in the /etc/ssh/sshd_config file of Unix servers:

TrustedUserCAKeys /etc/ssh/org_ca.pub
RevokedKeys /etc/ssh/org.krl

If I manually modified sshd_config and placed the relevant files into /etc/ssh/ could I expect the ssh server to behave as it would in any other Unix system? Would the changes survive system updates? If not, is there a supported way to have similar functionality in pfsense?