Two bath usually can't be used with zone developing. Most folks report that two bath developers give a lower contrast image than single bath. This is because of the way a two bath works.
The first bath soaks the emulsion with one part of the developer, I think the activator part like Metol, then it is transferred to the second part with the alkali to make it work. This goes on to exhaustion using only the components in the emulsion. The result is highlights use up the developer before the shadows and therefore get less development.
Therefore leaving the film in the developer longer will not add any more density to the highlights but may bring up more shadow detail on some films.
It makes a good compensating developer.