Feel free to post your suggestions here, or just email them to Support who could bring those more directly to Development's attention:
Development runs the show here, and they tend to keep their plans and progress pretty close to the vest and don't like to promise anything until they're sure it absolutely can and will be done. Thus, there's not much I have to offer in terms of specific details regarding a future development roadmap, but feel free to search the forum for "wishlist" to see what others have suggested that we're already taking into consideration.
I can at least say that many desirable (and tentatively planned) new features and functionalities are "backed up behind the dam" of our current Flash-based Seller Admin, which by now has simply become too complex and crufty to modify readily without breaking it in unexpected ways. As a centrally-managed system shared in common among all our 12,000+ merchants, any aspect of our system's behavior which does not have a setting in Seller Admin cannot feasibly be modified for any one seller without applying the same modification to all other sellers. Development has long been working on a DHTML-based replacement for our Admin panels, which will be much more amenable to ongoing modification to add new controls or alter existing ones. Any new functionality that would need a seller-specific means of configuration/management or other alteration of our Admin interface behavior simply has to wait until the new Admin is ready.
Bear in mind that E-junkie is deliberately intended to be a simple, basic solution to meet simple, basic needs. We can't be everything to everyone -- and trying to be that would lead to becoming the sort of sprawling, bloated, bug-ridden monstrosity that nobody really wants -- so we focus primarily on digital-product sales and small DIY businesses run by sole proprietors and "mom'n'pop shops" who maintain their own Web sites.
We fill an under-served market niche between the basic payment buttons provided by payment processors such as PayPal, closed-system online marketplace sites such as eBay, Amazon and Etsy, and the vast plethora of full-featured e-commerce software packages that you can install on your server to manage all aspects of your online presence entirely within your own site and domain, from building a virtual storefront with product listings, to an integrated shopping cart, on-site checkout, email marketing, promotions and more.
Sometimes a seller will simply outgrow our service to the point they may become better served by the latter type of more full-featured solution. That type of solution has already been done many times over, in many different ways, by many other dev shops, so we see no point in trying to compete with them when our existing niche where we've found success still remains so under-served. We're rather like a VW bug -- a simple, basic, well-made implement to meet most common needs that's also easy to maintain yourself -- so if what you really need is something more like a 4x4 truck or limousine, you'd do best to just get that, rather than trying to trick out your VW to be more like a truck or limo. :^)