In relation to your second question there is an option already available - you could use test lists. All tests included in a test list are executed continuously one by one. And a test list can be successfully executed in Artoftest.runner commandline.
If the above information does not suit your requirements and you still need to log a feature request you could do this in our Feedback portal
. In the same portal you could log your other query as a feature request describing the exact needs you might have.
Please do let me know in case of any further questions that might appear.
Thank you for your understanding and the valuable feedback.