grepping and found that you can override this setting, even though it’s not documented anywhere but in teh codes (so far as I can tell). To override it, just open up config.inc.php in the root phpMyAdmin directory and add this setting (anywhere):file located
eg:
C:\wamp\apps\phpmyadmin3.5.1\libraries\config.default.php
$cfg['LoginCookieValidity'] = <your_new_timeout>;
Where <your_new_timeout> is some number larger than 1800. Personally, I chose 28800, which is 8 hours. :P
