If you edit a little bit of code you can resolve the issue quite eaily.
Open simplemap/classes/simplemap.php
Find the load_plugin_textdomain() call and delete it.
Insted put an "init" call:
add_action('init', array( &$this, 'init_plugin_lang'));
Outside the function Simple_Map() declare this function:
function init_plugin_lang(){
$plugin_dir = basename( SIMPLEMAP_PATH );
load_plugin_textdomain( $this->plugin_domain, 'wp-content/plugins/' . $plugin_dir . '/lang', $plugin_dir . '/lang' );
}
Here you are. Your SimpleMap plugin is working togetherwith qTranslate.
Remember to setup the .mo files for your language inside the /lang folder of the plugin.
And don't forget that an (*eventual*) update to the plugin will blow up all of your edits, so pay attention when updating and backup your code before.
Cheers.
Giuseppe