The PNG and EXR formats for saving out renders is based on the Standalone. We could look into extending the range of save formats beyond what the Standalone supports. Given the considerable updates in progress right now, we will need to assess whereabouts in our current workload it can fit. From this standpoint, it seems like a fairly simple implementation. We may either be able to have it within the next two releases, or we may look towards tweaks of this nature after the grunt work for the current major features is stable.