@Ryan Hellyer - Thank you very much for the review Ryan :). The plugin (Dynamic Featured Image) is in its initial phase. It would be great help if you could help me by pointing out the feature that could make this plugin clean and more robust.

I haven't use multiple featured image personally but as far as i know I need to decide the number of images from the start. And this is the case with every featured image plugin available. But that's not the case always. What if the number is unknown?

Some of the sites i know are using it in different ways like MeroUdayapur.com is using this plugin to allow news authors to add advertisement banners at the bottom of their post. One e-commerce site is using it to display small gallery featuring the images of the current item the user is going to buy. In both cases the number of featured image required is unknown.