VQMOD to make manufacturers in admin /product tab to be multi-selectable as in categories

Featured :
Multiselect manufacturer in admin
Display multi manufacturer in fontend
Support SEO manufacturer
Support multi store
Vqmod modify (not need install sql)
Vqmod request

Demo :http://demo153.opextensions.com/index.php?route=product/product&manufacturer_id=7&product_id=47