Hi,
Sorry for the delay.
To change the word "product" to "location", create a file in your language directory (eg, lang/en) called my_phrases.php. The file should contain something like this:
<?php
$lang['_PRODUCT'] = 'Location';
$lang['_PRODUCTS'] = 'Locations';
?>
There isn't a way to add additional image fields at the moment, sorry. You can upload additional images from the administrator menu, but not from the public side.
There isn't really an easy way to remove the vendor field either, you'll have to change some of the code - remove these lines from system/classes/Forms/ProductAdd.php (lines 99 and 100 I think)
$vendor = self::createElement('vendor', $prefix . 'vendorid', __("FORM_PRODUCT.LABEL_VENDOR"), array('checkPermission' => array('productAdd', 'productAddModerated')));
$form->insertElementBefore($vendor, $prefix . 'description');
Making the description box smaller can be done with CSS, the easiest way is to add it to the header via config, in Admin > Config > Display > Additional Head Content:
<style type="text/css">
form#form_ReviewAddOnePage textarea[name=product_description] {
width:200px;
height:200px;
}
</style>
Hope this helps.
Gavin