In vBulletin I was used to alter database tables like this:
$dbalter->fetch_table_info('tablename');
$dbalter->add_field(array(
'name' => 'fieldname',
'type' => 'int',
'length' => '10',
'null' => false...
You will find the recent development progresses of XenTrader in this thread:
http://www.xfapps.com/index.php?threads/xentrader-development-updates.1/#post-1
Nice to hear your users like the iTrader script.
My plans are to release a free Lite version of "xenTrader" and a Pro version for less than 50$. However, I didn't think about the price yet. I will do this after the works are done.
I hope there will be a way to fetch the entries from iTrader...