Having the walk be interruptable is certainly possible (we did it in our King's Quest III remake, after all) but also involves extra programming work and increases the likelihood of bugs appearing. We'll probably look into this, though, and if it's not so time-consuming that it would throw our deadline way off, we'll consider adding it.
One thing to note in combat with mana regeneration is that when playing the full game most players will have purchased and stocked up on potions prior to battle. This, combined with faster mana regeneration speed as you progress, should help offset the "running around" behaviour.
One thing to note in combat with mana regeneration is that when playing the full game most players will have purchased and stocked up on potions prior to battle. This, combined with faster mana regeneration speed as you progress, should help offset the "running around" behaviour.