Maybe you've chatted with Phillip at one of the many events Peplink has exhibited at. They offer a Software Development Kit (SDK) and encourage their customers to innovate. That's what originally got me interested in the Manga unit, since that's very different to some other Linux vendors.
However, I didn't really want to take on the extra effort of using special configuration tools and build chains just to reduce the power consumption of an existing system. I mentioned that to Phillip. He told me that he'd been routinely using various storage devices over USB and hadn't had any trouble. So, I decided the obvious solution was to install my normal distribution onto the Manga. That way, I administer it just like the box it replaces.