The Source Pack 'N Go main UI was presented a while back. It has many other settings not introduced yet. The following How to Pack is one of them:
As can be seen, users can manage the packing behavior in many ways, saving solution changes first or not, cleaning up the solution before packing, overwriting packages with the same name if any, or packing with a password. In addition, the package names can be in different ways as well, using the exact solution name, using the solution name with an auto-increment number, or using the solution name with a time stamp. It also supports auto-packing based on a time internal.