Mailing list support is also planned, but not supported yet.
for a list of feature requests see List of Feature Proposals
Here are the specs of deltachat https://github.com/deltachat/spec/blob/master/spec.md (though this document is a bit outdated I believe.)
The best way to make bots for deltachat is still to use the deltachat core.
When you’re creating a plugin, couldn’t that plugin require deltachat go bindings? I mean go compiled anyway so a small rust compilation wouldn’t make that big of a deal I guess.
depending on c dependencies seems to be supported by go cgo command - cmd/cgo - Go Packages
you can always ask them if it would be ok for them…