I'm interesting do you suppose landscape (paths, distances, positions of trees, terrain and doodads design etc) in D2 is more balance, and do you don't mind to making D1 more similar to D2? What problems has the D1 landscape in your opinion? And what is wrong with D2 landscape?
For example, I do not like that in D1 there are ward-places that are not in D2 and I hate tree on top rune ward-place.