It seems like we need to get opinions from @sfackler and @alexcrichton about expanding the scope of env_logger.
If you can't get their feedback I'd suggest formulating the issues as "consider blah ..." and waiting for more feedback.
I went over the checklist and everything looked fine. @sebasmagri before you file the issues do you mind writing them up in checklist format like they will appear in the tracking issue and post them here for review? For reference here's what I did for error-chain.
The matter with moving env_logger out of the log repo needs to be resolved soon, because the situation is pretty unclear right now. The two code-bases are presumably already diverging.
I'd suggest filing a PR against log to remove env_logger to politely force the issue.