Reсently my plugin for Unreal Editor have been published to the marketplace. Here is the link: https://www.unrealengine.com/marketplace/qt-creator-source-code-access
The plugin is free.
For using it you need Qt Creator installed and made steps from wiki tutorial: https://wiki.unrealengine.com/Using_QtCreator_With_UnrealEngine4
Now I’m working on auto Qt Creator project creation, so you do not need set up it manually.
Please, leave feedback.