No, physic changes values are only visible running the game, not visible changes in edit mode.
Can be usable in real game production if you adjust thousand models physics and characters, if you need to lauch game each model physic adjusting.
Temporary solution
1) import detailled mesh , don't add collision
2) import low poly collision mesh , place it at same position detailled mesh, add a full transparent material
You have detailled mesh, with low poly collision, but it's too slow to make physics for thousand models in production mode
Solution 2
Import low poly collision same time with hight poly from 3D file, editor will add detailled visual mesh and add Physix collisions to low poly mesh.
It works
https://answers.unrealengine.com/storage/attachments/2814-quest.jpgSolution 3
If we can visualize adjust collisions in editor (no runtime game), we can add two three collision shapes to cover the detailled mesh.
Solution 4
Editor can create a low poly collision, we enter number of polygons and press button "create low poly collision"
All these reports could take some days to fix but we shall focus on getting these things working.
Yes , engine basic improved usability is lot more important than Gen2.