<option class> for system databases and schemas - information_schema and driver-specific (thanks to Vaclav Novotny)
Define foreign keys name - http://forum.zdrojak.root.cz/index.php?topic=185.msg1255#msg1255
Skinnable plus.gif and other images - http://typo3.org/extensions/repository/view/t3adminer/current/
+Plugins autoloader: branch autoload; are there security risks?
? Filter by value in row under <thead> in select
? Column and table names auto-completion in SQL textarea - http://blog.quplo.com/2010/06/css-code-completion-in-your-browser/
? Aliasing of built-in functions can save 7 KB, function minification can save 7 KB, substitution of repetitive $a["a"] can save 4 KB, substitution of $_GET and friends can save 2 KB, aliasing of $connection->query can save 24 B, JS Closure compiler can save 2 KB, not enclosing HTML attribute values can save 1.2 KB, replacing \\n by \n can save .3 KB