Anybody know if it's possible to add new scripted interactions right now?

Yes, it should be.  Scripted interactions are actually just special conversations.  You can check out any of the existing ones at "Exported/Design/Conversations" to see the format for them (see any file with an XX_si prefix).  Make sure you add the new conversation to the file "Manifests/conversations.manifest".  This file can be overridden in override directories.

 

Once you make the conversation, you can trigger it by adding a call to StartScriptedInteraction anywhere else in data that will take a script call.  You can also test it via the command line with the same command.