magneto Admin associated product grid adjustments, add quantity, status & multiple select attribute

I have created a small Magento extension to add columns to the associated product tab grids for viewing grouped and configurable products within the magento admin area. The extension uses/extends these two files as of now /app/code/local/Rebel/Adminhtml/Block/Catalog/Product/Edit/Tab/Super/Config/[login to view URL] /app/code/local/Rebel/Adminhtml/Block/Catalog/Product/Edit/Tab/Super/[login to view URL] The extension currently adds a grid column showing the product photo for associated products for both product types. I need these adjustments to the associated product grids: 1) Add column showing the product stock level qty value that can be sorted and filtered for both grouped and configurable product tyles 2) Add column showing a global multiple select attribute that we created that can be used to filter products in these two grids. 3) And also to add the status and edit product link columns seen on the configurable product associated products tab grid to be added to the grouped product associated product tab grid. 4) Finally, the grouped product associated products has the title=# for each value, which when clicked returns you to the top of the list. We need this removed as we will be working with very long lists. I will provide access to my development server where you can adjust files to complete this project. I will need to know which files are edited so I can replicate it on my live server and don't want any core files hacked. I found this code which seems close to the solution for the qty field, but I couldn't get it to work, i might help... added to protected function _prepareCollection() ..... ->joinField('qty', 'cataloginventory/stock_item', 'qty', 'product_id=entity_id', '{{table}}.stock_id=1', 'left' )->joinTable('cataloginventory/stock_item', 'product_id=entity_id', array('stock_status' => 'is_in_stock')) ->addAttributeToSelect('stock_status');