Show Custom Error In sharepoint site

As a developer, one of the first things I do after I have setup a web application & site collection is:
Open the web.config (“C:\inetpub\wwwroot\wss\VirtualDirectories\<port>”) and set:

1. Debug=”true” instead of the default of Debug=”false” (I do a find on “debug” in Visual Studio)
2. CallStack=”true” instead of the default of CallStack=”false” (I do a find on “callstack” in Visual Studio)
3. CustomErrors=”Off” instead of the default of CustomErrors=”On” (I do a find on “CustomErrors” in Visual Studio)