This was a useful feature in Eclipse...especially when logging into a Salesforce Org for the first time. Using Eclipse and this feature you could avoid the security verification token window.
Posted 25 Feb 2016
Thank you for your suggestion about the using of web forms.
We will discuss an ability to implement this feature to the IDE.
However, our team plans to add the credentials manager to The Welkin Suite.
I'm afraid I cannot tell you the exact terms when it will be added, but the ways of implementing this are already under discussion.
The Welkin Suite