It won't work, because some files need to be installed directly into .mod files.
You can remove "Required=c_mirachoke.ncs" line in rcmchanges.ini.
Unfortunately, I have no idea how mac version structured, so expect some drawbacks.
It is. Still, you can expect an update for EE soon. Nothing major, just a few tweaks.
Haven't testen M4-78EP 1.5, though. So if you experience any problem, report in.
1.8.4./1.8.5. changed nothing that could break EE, plus all post 1.8.3. fixes were already covered by EE.