@ : Just so you’re aware you’re a rock star! 
I wanted to make sure the threads that are discussing are linked here.
AnswerHub Post: https://answers.unrealengine/questions/14140/why-isnt-3dconnexion-supported.html
Forums Post: https://forums.unrealengine/showthread.php?380-Support-for-Space-Navigator-3D-Mouse
Support for is coming. started work on the plugin a few weeks back as during one of the Epic Friday’s. There were a few snags that will require a little more additional work than thought, but is still working on it. He’s updating on these two posts occasionally with his progress.
I’m definitely excited to try out my space navigator once is integrated! 
Just for clarity sake, one actually is supported. Personally not a fan of it, but it gets some love too.
.unrealengine/latest/INT/Engine/Content/Types/Textures/Importing/index.html
page will cover all the textures types that are supported.
The following Texture formats are supported:
.bmp
.float
.pcx
.png
.psd
.tga
.jpg
.dds - Cubemap Texture (32bits/Channel, 8.8.8.8 ARGB 32 bpp, unsigned) See Cubemap Tools for more information.
.hdr - Cubemap Texture (LongLat unwrap)