Currently there is no way in OSCADY PRO to adjust default parameters. You cannot, for example, change the default phase minimum green. However, when you create a new item (a new phase, stage, traffic stream, lane, etc), then the new item will inherit its properties from the last entered item.
So, if you set up Phase A with your desired minimum green, etc, then click on Phase A and select Add Another Phase, then the new Phase B will have the same properties as Phase A. In this way you can use the existing items as templates for new items.