Probably was, there aren’t any reviews out there for the 5015, and only a couple for the smaller units. Found a pretty good YouTube review for one of the smaller ones.
As far as the dual input V input you suggested, a different option, that might be easier to implement, would be to have a fine adjustment pot for the voltage output. That way you could wire up any type of leads you want, and adjust the voltage until it matched what you actually have at the cable ends. That would work for a lot of different wire sizes and leads, because everyone’s is going to be different in a project like this where you have to make your own. And for those that don’t want to, or aren’t comfortable with adjusting it, it could simply be set to read at the unit from the factory, that way it’s essentially be unchanged from how it works now. But it’d be a great benefit for those who are comfortable tweaking it a little.
Does that sound like something that would work or that could be implemented by the manufacturer?