No, you wait for RMerlin to do his magic (fix bugs, add features and backport even a newer beta firmware's fixes) and then you simply flash the latest available from him.
Just a heads up; I've had no issues as I stated in my earlier post, up until now. As soon as I upgraded to 378.55 on it, I have problems with packet loss and cannot access my NAS which is on a media bridge.
rolling back to previous version of the firmware sorts things, but this goes to show that you really should touch on wood when making your statements around here.