Hi,
At the risk of disappointing you, Id have to tell you that UE4 editor is not capable of bending geometry. :eek:
This has not much to do with 2014, but more with the fact that geometry editing is not the focus of UE4.
UE4 is an engine that uses assets that you edit with external programs.
This is not only true for meshes. If I want to edit a texture, I need something like photoshop, or MSpaint.
Why doesnt the texture editor let me edit the graphic? Right. Because its not the focus of UE4.
The same way you need audacity or audition, etc, to edit sound files.
That is just the way it is.
Besides, any geometry editing capability would not be as “powerfull” as what 3d apps have to offer.
It would just bind development resources and distract from engine improvement.
What is good about the year 2014 though, you dont have to spend $3000 on a modeling software that does your bending.
Either get blender for free, or get a student version of 3dsmax, or maya, which are also free for 3 years.
If you can bend it, its not a primitive anymore 
Cheers,