OK, they just posted in the cPanel forum (I missed it before). You have to open a support ticket to get the new piped logging. They only want 'real word, production enviroments' (Yea, we're going t run edge in production).
Having said that this sounds even worse:
When the piped logging method is enabled Apache will pipe logs to a common target process, a program started by Apache that is listening on the pipe; the receiving process will then automatically split the logs into their expected per-domain version.
Assuming I understand this correctly, Apache will be writing all logs to a pipe. This new daemon/process will then read the pipe and split the logs into the individual sites log files. Since the program to read the pipe is 'started by Apache' and we're not running Apache this does not sound good.