There are two things to consider:
1.) Is DOS trying to be a true RPG like Neverwinter Nights (using D&D3.0 ruleset)? If so I would suggest, that immersion is more important than being able to run everywhere in a split second. It does take away the main focus from "killing stuff" (aka hack and slash rpgs). But it also requires the devs to have enough interesting stuff happening rather than to have us run back and forth between 2 places in every quest.
2.) Is DOS following the hack and slash path of RPGs, yet wants to be a little bit different than torchlight/diablo? Well, then I guess increase in movement speed would be best, since you want to be in the next fight as fast as possible.
