Command selector update for "x,dx,y,dy,z,dz"

I have a suggestion regarding the selectors
 dx, dy and dz. Currently, if you want to 
select an area, you have to specify the 
coordinates of the first corner point and
 then use dx, dy and dz to specify the 
respective distance of blocks to x, y 
and z. This is related to the coordinate 
system in Minecraft and just makes the 
whole thing unnecessarily complicated. 

Wouldn't it be much easier if you could 
enter the coordinates of one corner point
 with x, y and z and the coordinates of 
the second corner point with dx, dy and dz?

Thank you for reading!