There are situations in which distances and positions are supposed to play an important role: what if there's a sniper atop a tower? What if a terrible ritual tears open a chasm in the middle of the battlefield?

The advice boils down to the following:

• Don't overcomplicate things. Play to this game's strengths, and avoid situations in which suspension of disbelief becomes too strained.
• Sometimes, experiment. If you want to introduce distance as an important element in the game, treat it as a "puzzle" that can be solved in creative ways while the conflict progresses. For instance, you might make melee attacks useless in a battle between two flying galleons — at that point, engaging in close combat would require approaching and boarding the enemy ship... time for a Clock!

In the end, the most important thing to remember is that conflicts shouldn't be resolved through careful movement and positioning, but through clever use of the character's Skills and actions.