It would be nice to be able to turn off the ability to customise dashboards for certain groups and/or different dashboards. That way certain groups could have a default dashboard that can't be edited but in JIRA Enterprise, they could add another dashboard that they could edit but not be able to edit the default dashboard.
Also, certain groups could edit the default dashboard where as other users could not.
I create a text portlet with HTML code showing their client logo and personalized instructions and it looks really nice. Then I hope they aren't adventurous enough to find out how to change it
If user management had a flag that dictated whether they were permitted to edit their dashboard, I could assume they haven't messed with what I've set up for them.