I have not seen the issue with the RTC, but my slice is connected via RJ45 to the network, i will see if i can test this sometime.
At the moment that is the very latest build bought in line with the latest DEV release from OE.
img files are there just for debugging a possible build issue.
I will keep the current builds updated with the latest OE commits
as for the add on, i might be able to build those, which addon is missing?