[OE-core] read-only-rootfs support for systemd

[Michael]

Hi all,

I noticed that support for "read-only-rootfs" in IMAGE_FEATURES is 
currently limited to using sysvinit.

Are there any efforts already underway to add support for 
read-only-rootfs for systemd?  Aren't there already OpenEmbedded users 
out there generating read-only root filesystems with systemd, or is this 
somehow obscure?  Is anyone aware of technical landmines toward pursuing 
this that I should be aware of?

Also, I would like this restriction to have been mentioned in the Yocto 
Project Development Manual where the feature is mentioned.  How/where 
does one make a suggestion for an improvement in this documentation?

thanks,
Michael