As we said I introduced API changes to support scenario 1) of asynchronous event corresponding to §1 in 4.1.1 (https://docs.google.com/document/d/1lFtgLm6hY-uECdA1r0Sfimq6vkVYThoUZsevPUaSP0E/edit?usp=sharing)

The changes are quite small : 

Regarding scenario 2) (each event launched in different threads)I think it can be done without having the feature specific to evens. We could discuss the introduction of @Asynchronous calls in CDI and obtain this behaviour by annotating observer method by an @Asynchronous.

Wdyt

Antoine