I would like to be able to create an Admin account which would have less access, only allowing them to clear a sign-in and also export the .CSV file. I do not want them to be able to edit the sign-up sheets or tasks.
Another copy and paste from the documentation for you:
User Roles – Sign-up Sheet Manager
This plugin adds a new user role to the WordPress system called “Sign-up Sheet Manager”. This role is the same as the “Author” role, except that it adds the “manage_signup_sheets” capability. If you have users who you want to allow to create, edit, and view sign-up sheets on the admin side, but don’t want them to have full admin access, you can either assign them to the Sign-up Sheet Manager role, or use some type of role/capability editor (such as Role Scoper) to assign the manage_signup_sheets capability to them.