Can I disable the application without uninstalling
Out of the box the application is enabled, but the settings are configured such that it should not change the default salesforce behavior, which creates a new campaign with the default member status values of 'sent' (configured as the default value) and 'Responded' (configured as a Responded value).
In some instances administrators may want to disable the application, this can be achieved by accessing the applications configuration page from the installed packages settings page.
Setup > Installed Packages > click the 'Configure' link by the Easy Campaign Member Status package
Uncheck the Enabled checkbox. This will disable the application.