As said, Ctrl+Alt+Backspace merely kills X without restarting. While LXDM keeps running in the background, terminating it manually & restarting LXDM (whether via rc-service or directly) doesn't take me back into the Login screen. (Adding "DontZap = false" to xorg.conf shouldn't be an issue since several years, trying it merely resulted in failure to start LXDM. As I tested, it affects sddm-consolekit as well. SLiM didn't play well with OpenRC and rendered me unable to use tty1-6.
I changed nothing in /etc/inittab.)
Is this a result of misconfiguration or indeed related to OpenRC?
I used CK2 under Slackware (BSD-style init) with KDM for a while with none of such issues.