Yes you can manually edit login.salesforce.com to test.salesforce.com from the below path:
Source --Web_Resources --Files --Views--js--Services-- ....

Thanks

a. Can we use test.salesforce.com for development and testing purpose?
b. How can we get PICKLIST values from Salesforce?
c. How can we add default values and use?
d. What about using check boxes like Active or inactive?