One annoyance (and ui inefficiency) i'm finding in V4 is not having access to the imagur or post process through the camera node and always having to go through the render globals to access these. I argue that both of those functions are adjustments relating to the camera, thus are all adjustments you'll be tweaking in tandem. It would be nice to have the option to access these through your camera (just a button, like is in the render globals would work fine, i'd say). Probably seems like a minor thing but it really creates a lot of extra clicks and mouse travel, when it could all be done from the camera panel in the hypershade.
Current workflow:
1. adjusting things in camera, via hypershade
2. deciding I want to tweak post process
3. Open render globals
4. press post process button
5. back to hypershade to adjust post proces
6. decide I want to adjust imagur settings
7. reopen render globals
8. press imagur button
9. back to hypershade to adjust
Proposed Workflow
1. adjusting things in camera, via hypershade
2. deciding I want to tweak post process
3. Press post process button in camera
4. adjust post process
5. decide I want to adjust imagur settings
5. press imagur button in camera
6. adjust imgur settings