Hi NanoMind,
The problem you’ve run into is a common one for those who use what is considered to be an Architectural Viz software into a game engine that needs to have things setup for optimization and run-time. UVs have always been a big part of game development along with Lightmapping in Unreal. These two go hand in hand when wanting to have your model look great!
While there are improvements that will be made to Unreal Engine 4 in the future I’m not sure if Unreal will completely replace 3D software that allows you to have full control over your UVs and Lightmap UVs. This has been a vocal issue with users of Sketchup and other similar programs that don’t use UVs like 3Ds Max, Maya, and Blender.
Thank you for the feedback though! It certainly is heard and Epic does look into ways that can try to accommodate those if there is a true need for it from the community. This however does require time and research to look at possibilities.
Thank you!