These deep mods are not subscribed through Steam, so you'll need to supply executable files and instruct end users on how to use them. You'll need applications to extract, modify / hack and re-import assets into the game standalone asset bundles.
This article explains how to do modding that goes way further than Content Packs that the Shadowrun Editor is capable of creating by modding game files (asset bundles, to be more specific). 12.3.1 Animations for the Race - Identity schema.12.3 Getting the Animation to work With Game Mechanics.12.2 Setting up to Play Animation from Manifest.11.2 Easy Solution: inter-bundle texture mixing.10 Adding New Drones as Prefabs and assigning them to Drone Items.9.5 Building the Assetbundle and turning the prefab playable.9.4.1 Configuring the PlayerBody Monobehaviour.9.3 New Method (Unity Studio any bone structure supported by the game).8.2 Adding a New Item Prefab with a New Asset Bundle.4.3.2 Create as Many New Icons as You Want without replacing (requires SRR Electric Mod).4.1 Viewing your Texture on the Mesh with Unity.4 Changing Textures and 2D data in general.