I previously posted a request to be able to hide views.
There are two issues with not being able to hide views:
1) Usability - having the drop down list cluttered up with completely useless views is very annoying.
2) Security / User Groups - having ALL user groups being able to see ALL default views prevents setting up a secure system.
If I set up 2 user groups ("Group 1" and "Group 2").
I want Group 1 users to be able to see only US customers - so i create a custom view the only shows US customers.
I want Group 2 users to be able to see only European customers - so i create a custom view showing only European customers.
It is easy and very useful to do this.
But ALL users can see ALL of the default views which means you cannot hide data from specific groups.
This is a great shame as you have lots of features which allow me to restrict access to tabs or custom views to create a custom interface for each user group - but the whole thing is let down because ALL users can see ALL default views.