This is one of the theoretical ideas out of Halfbakery (here), proposing, that time behaves much like modern Internet, where links are one-directional ("digraph"), and that to make the time be space-like, we just need to add the missing back-links to the web of alternate histories.
Not specified, exactly, how we would add those back-links though. Further ideas how to elaborate on this, are welcome~
This perhaps should be turned into a category, as it only provides a concept, rather than method.
Add a backlink to time, then it is bidirectional time, or multidirectional time.