I'm considering starting a rather massive urban outdoor documentary photography project - details on that at a later date when I've determined its feasibility and logistics involved. I did a test run, shooting several subjects and loaded the files into Lightroom. Usually I would not allow myself to be constrained in cropping, dodging/burning, curves, levels, etc. But as the project I'm about to start is first and foremost for documenting a contemporary urban environment in its unadulterated raw state, there are certain ethics I should be aware of when shooting, as well as keeping the integrity of the photos themselves. So before I start shooting, culling and processing I need to take a deep breath and change my approach.
I've never done documentary photography or photojournalism, so I would appreciate any pointers on what's allowed and what's not, and what should be avoided. I'm not only referring to post-processing, but also the process of shooting, and picking the keepers (culling). I understand that in PJ work cropping and spotting are generally not allowed, especially if it changes the photograph's message. Also, extensive curves or other manipulation is probably something to be avoided. Anything else?