Here is another hack for the Core. This is for choosing the path of the uploaded files:
1. Open /wp-includes/functions-post.php
2. Find the line #843
$dir = 'wp-content/uploads';
Just replace with the path of your choise
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For those who doesn't want that trick of making subfolders with year and month, just follow these steps on the same file:
1. Scroll to the line #862 and #863
$pathy = "$path/$y";
$pathym = "$path/$y/$m";
Replace with:
$pathy = "$path";
$pathym = "$path";
2. Scroll to line #879
$uploads = array('path' => $pathym, 'url' => get_option('siteurl') . "/$dir/$y/$m", 'error' => false);
Replace that line with:
$uploads = array('path' => $pathym, 'url' => get_option('siteurl') . "/$dir", 'error' => false);
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That's it!! =) Another quickfix while we wait for programmers to integrate the possibility to do it through the dashboard.