One of the JunOS features we really appreciate (especially on remote devices) is commit confirmed. But when we cluster a pair of SRXs it is not supported. Are there any plans to incorporate this functionality into clustered environments?
So this is a known limitation for us, and it has to do with wanting to ensure that there aren't simultaneous changes to the configuration on both nodes. If you're in a bind and need commit confirmed, ensure that nobody is editing the other device's configuration, and enter configuration mode with "configure exclusive"
You can then issue commit confirmed in cluster mode. I definitely agree with you, this is one of my favorite features. I believe there are some plans to fix this in the future, so please keep in touch with your SE for a roadmap discussion and he/she should be able to keep you posted on this feature.