Don't think any stock based roms have it, not quite sure if any of the N roms do, maybe a few. This is one feature I always like to have, don't know why, not to have it is really a pain, so it's really a huge plus to have have it baked in, so I feel you.
However, there are a few apps in the play store that give you this option, hey it's an extra app, but it's better than nothing.
Simple AOSP is Android N and it has a customizable power menu, and some other really simple build tweaks. I've been using it since it's initial release and the latest release has given me 0 issues.
Sorry for the weird link. I'm on mobile.