You can create a View Template with a custom scale setting in your Project template and that way when you start a new project the View Template will be available to set any view to that scale, or by selecting multiple views in the project browser you can set them all to the same View Template.
You might try opening your project template and pre setting views to this custom scale.
Mel Persin, AIA
AEC Technology Consultant
Technology to Visualize and Realize Solutions