Hi is there a way to have a flow decorator add other flow decorators?

More specifically, if at this place in the code (https://github.com/Netflix/metaflow/blob/master/metaflow/decorators.py#L503) a copy of the _flow_decorators dictionary was taken before the iteration, flow decorators could add new flow decorators. But as the code is right now, this can't be done because it is a concurrent modification of the dictionary while iterating. Are there any plans to change this (or would you accept a PR that makes the change)?