Hey wmbuRn,
I have just tested out your issue once again and i am still not able to reproduce a crash. I have also tested this issue with a Mac and have not been able to see a crash. I am using the iPad Air 2 on 8.1.
Would you be using the source build of UE4 or the Binary build? Have you tested this issue with the new 4.7 preview or an older version to see if it still crashes? If you do decide to use 4.7 preview, be sure to open a copy and do not convert in place as that build is an unstable build.
Thanks!