In phpMyAdmin 3.3 most of the export settings were visible in one page without scrolling, hence requiring only very few clicks to export what you need. But in 3.4 when I try to export the table structure I first need to click '(o) custom' then scroll down and search through all the text where in order to find where I select '(o) structure'. It feels very unintuitive for me.
What about: a) We put all the settings in jquery tabs b) On the first tab will be the most used options: Format, Output type (File / as Text) and what to dump (2 checkboxes for each data and structure)
Here's a demo of the tabs: http://jqueryui.com/demos/tabs/
Also, all the pma demos on the server seem to have troubles: Warning in ./libraries/dbi/mysqli.dbi.lib.php#111 mysqli_real_connect(): (28000/1045): Access denied for user 'root'@'localhost' (using password: NO)