sql_error_log_dir or generic error_log_dir

Could we have and sql_error_log_dir or perhaps with all these features a log_dir for error, slow sql_error and anything else to set a directory to write all theses logs to.

All logs default to the log_dir unless an absolute path is set for the log file name, could be a useful feature.
audit_logs may or may not abide for the reasons of protecting the audit trace