std.range lockstep is not input range but opApply entity. Workarounds?

[mist]

I basically want to be able to do stuff like this:
auto result = map!( (a, b) => a+b )( lockstep(range1, range2) );
Are there any standard short ways to wrap an input range around 
struct with opApply (which Lockstep is)?

Also what about redesigning Lockstep as a proper range? I could 
do a pull request but not sure about current intentions.