Hi,
Regarding to the current level question, the motor spec normally give the 1A means the full stepping mode current level. If you are using micro stepping, you can setting 1.4x of that value as the peak level. So the rms level will still be 1A.
Stall detection parameters could be differenct regarding to the motor parameters and the running conditions such as speed and loading. Have you already get a basic stall detection results? We will get back to you later on your stall questions.
Best regards,