Hi kamrann! Sorry for the delayed response.
Yes, we’re allowing code plugins now on a limited basis. We’re developing and streamlining the processes for integrating submitted code plugins with the engine, and so we are reviewing submissions on a case-by-case basis to see which we can support in the near term and how to plan to better support all submissions in the future. Right now, we’re collecting information for everyone interested in developing code plugins and developing standards. We’re still working out our precise requirements, and this is what we require as of now:
* Integration source code (not the full code plugin source, only the source code for the parts of the plugin that integrate with UE4)
* A signed Marketplace Distribution Agreement, and any amendments needed for special cases
* Plugin must be 4.8 compatible and build against the latest binary distribution of 4.8
* Plugin files are restricted to the single folder underneath Plugins
* Submitter must be willing to update with each major engine update (4.7, 4.8, 4.9, etc)
I’ll get updated folder structure info ASAP. Thank you for pointing that out!