The key, thorny issue here is that -- unlike a full-featured, freestanding e-commerce software package like Magento, where you get your own copy of the software to install on your own server, reconfigure and modify as-needed -- E-junkie is "software as a service", a centrally-managed Web application which executes only on our own servers and is shared in common among all our users.
This means there is no practical way to modify our software for just one client without applying that very same modification to every other client who uses us, or at least without developing that modification into a fully-fledged feature that any of our clients could enable/disable or (re)configure as needed. That makes every "custom modification" request into a general feature request for the wishlist, which falls under our overall development strategy explained here:
Nobody can be everything to everybody, and trying to be that is how software turns into a bloated, sprawling, bug-ridden, crufty monstrosity that nobody actually wants. We are not trying to be, nor interested in becoming, an all-singing-all-dancing, full-featured e-commerce storefront solution competing with Magento, Zencart, Xcart, etc. That market segment is already well-served by those and other competing solutions.
Our focus, and where we have found success, is with a heretofore grossly under-served demographic: "mom'n'pop" do-it-yourself'ers of modest technical ability. E-junkie is, always has been, and always will be targeted as a simple, basic service for simple, basic needs. The majority of our subscriber base comes to us precisely because they don't want nor need the complexity of Magento, et al., so we don't try to compete with those solutions. If a seller's needs become greater or more sophisticated than what we can reasonably support or provide for all our clients across the board, we would suggest that perhaps that client has simply outgrown us and is ready to level-up to a full-fledged e-commerce storefront solution.
We are like a hammer: a simple tool with a few simple uses; if you really need a Swiss Army knife, just get one of those instead of sharpening your hammer and bolting attachments to it. :^)