dsadm user on windows

[synsog]

Hi All,

We have DS 8.7 on Windows 2008 R2 Enterprise

1. Is is mandatory/recommended to create the the user "dsadm"?
2. If yes what is the advantage of doing this?
3. Is this user relevant only for Non Windows (Unix/Linux..) Env?
4. If we create this, is this a Windows user we need to create with Admin Privs or is this only specific to Datastage?
5. Does this used need to have a Non-Expiring password?

Thanks in advance for your help