Circular Route Planning - More User Controlled Variables?

I'm a big fan of the circular route planning function, but on occasion would like to generate a route with more than just total distance as the user selected variable. For example, rather than repeating multiples of a 20km loop (dull!) it would be great to select for total distance and, say, max distance from an origin point? I would find this particularly helpful when exploring a new area (often with a train station as an origin point).

To an extent the route planner already does this, but just doesn't currently join the routes together.