1. hoping to have a JMAP archive format at some point which should cover that. I'd hope that normally you'd be fetching a delta update rather than the whole thing. We've got enough bandwidth for a few people do to it, but I wouldn't want every customer pulling their entire archive every week of 99% the same immutable data; that would be kinda sucky.

2. yeah, I'd love that too - we're keen to integrate with everything else that people are using. We have a basic in-house IdP thing for our own staff to authenticate against our hosted services, but haven't scaled it out. This will happen eventually, though I've been burned enough times I don't want to promise a timeframe.