If you want alarm memory after a zone has tripped and reset, naturally you need to be able to acknowledge the alarm. I do not see yet how to do this. Needs more work. Or documentation from Elk.
Well after a long "dialog" with ELK support, it turns out that Aux1 and Aux2 alarms *are* acknowledged and reset by entering a valid user code.
Oh by the way, this will also arm the system. Not exactly a desirable result.
Now I will have to revise most of my alarm-handling rules. Probably all of them. But first I will have to prepare a matrix of alarm types and their characteristics to supplement the Elk documentation.