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Do Apple iWorks apps (and Keynote in particular) support plugins or add-ins in any form? E.g., to allow 3rd party developer to develop a plugin that can run within the context/scope of Keynote app. This plugin might extend app functionality, or aid a targeted (say enterprise-specific) workflow.

Going by the announcements and presentations from WWDC 2019, Apple obviously is on the way to deprecate kexts , but the sense I'm getting is that they will still be allowed fully (i.e., as they are today) on Catalina. Is this true?Also, if I were to request a new kext-signing cert today, and receive it a couple months from now, would there be any extra restrictions placed on kexts signed with this cert that would not be placed on older kexts?Thanks.