"UE 4.8 will have the ability to use “Far Shadow” with skeletal, static meshes, and landscapes.
This is only functional with Directional lights that are set to Movable.
By default this is turned off and needs to be enabled int he source light by adjusting the Far Shadow Cascade Count and distance.
Just because the far shadow flag is enabled does not guarantee it will have a shadow at great distances.
The bounds of the actor is still taken into consideration for when to stop rendering shadows for it. This is a way to keep the editor optimized and the game running smoothly.
If you are not seeing the results you need with far shadow, try bumping the mesh/actors bounds scale up just a little until you get the results you need.
I wouldn’t recommend this for lots of objects, but only necessary ones when needed.
I hope this helps.
Tim"
https://answers.unrealengine.com/questions/228298/does-skeletal-mesh-support-far-shadow.html
So this means that UE4 will continue to squeal over my to large bounds scales on my small objects when I build the light 
?
Or have i missed something.
Cheers!