I have an extension i created that modifies core attributes. I want to make sure it is installed after all magento core modules. Is there a way i can use the depends node in my app/etc/modules/*.xml file to set the extension to be installed last? or do i have to include every core module inside it?
You need to include in the
<depends> node the modules that you actually modify.
I doubt you modify something in the tables of all modules.
If you modify a product or category attribute include
<Mage_Catalog /> if you modify a customer attribute include
<Mage_Customer /> if you modify an order column include
<Mage_Sales />...you get the point.
The order you use for the depend modules is not important.