Using this simple plugin you may allow your site admins to be redirected on a specific component on backend login.

Documentation:

• In the field Redirect Component place the name of the component, as it appears in the backend url without the το com_ part. For example, instead of com_virtuemart write virtuemart.
• In the field Redirect Usergroups: choose the group you wish to be redirected on backend login.

We offer it for free.