Not important at all.
What would be helpful would be an interstitial "are you sure" page which could help avoid committing a change without review of submitted data.
This offers two benefits. First, avoiding inadvertent deletions and updates. Then, in the event of some sort of security flaw such as the widespread PHP_SELF based injection flaws in a certain famous shopping cart many of us have worked with in the past, it can stop those flaws dead as a second line of defense...
David