Corel comes with a preset list of Scales. There is one spot to create a custom scale. I use Corel to do permit drawings about 40% of the time, and 1" = 10', 1" = 20', 1" = 100', ... are VERY common permit site plan scales. Corel does not have them in the list of defaults. Is there a way to customize the drop down 'Typical Scales' list?
What kind of permit drawings are you talking about? We do sign permit drawings all the time and never use scale.
In US? Every sign permit I've ever done requires "to-scale" drawings. What part of the country are you getting permits? Give me your latest county/city you got a permit from. I'm curious why all the ones I've done require it.