Custom .test-duration name + adding new tests

Hi,
Is it possible to add a possibility to choose the name for .test_durations file that will be used?
For exmaple:
 --test_duration_file .some_name

Also i wanted to ask, if i have some new tests in my suite, and its not yet in the duration file,
And i run pytest split on that suite,
Will the new tests will run?
Or only the tests that are in .test_duration file will be run,

Thanks, 
Shai