When an error report happens now I collect certain relevant info about the error and current phpmyadmin configuration.
I currently collect error message, line number, file_name, stacktrace if available, phpmyadmin version, user browser name and version, user os and steps for reproduction by the user.
do you think any other thing is relevant to the report. I can easily add any more info if required I just cant seem to find what is important for debugging. I thought I would ask you since you have a lot of experience debugging problems in phpmyadmin