I have tightened some security settings on my server e.g. open_basedir and noticed that invoiceplane’s tmp directory setting is hardcoded to /tmp. Is it possible to change this or (in a future update) make this a setting in either config file or interface?
Do you mean the Sumex Invoices implementation?
This is the session driver that uses the temporary directory specified in your global PHP configuration. Please make sure that the directory is writable.
More information: https://secure.php.net/manual/de/function.sys-get-temp-dir.php