I want SPF/DMARC etc. results as features alongside all other message content, and overrides (like whitelisting, clicking "not spam") to apply similarly. Valid SPF/DMARC is so commonplace in spam that it's not worth treating specially, there are much more reliable indicators (e.g. domain age, Google safe browsing list, Phishtank) that in a variety of cases a user might still want to override.

I'm actively playing with this stuff so probably my requirements are a bit special, but even aside from that, it does still feel quite irksome that all mail input can't be cleanly recorded.