FireLance
Legend
I think I'd be happy enough if WotC just added a "Sustain Attack" clause to the paladin's Divine Challenge. Based on the current rule for Divine Challenge, the paladin has to use a minor action and be within 5 squares of his target to mark it. If the paladin attacks his mark in the next round (even with a ranged weapon or a prayer) the Challenge is maintained automatically. If he does not attack his mark, he must still be within 5 squares and spend a minor action to re-issue his challenge.
This broadens the archetype of the paladin slightly - paladins of trickster gods, for example, could make use of the tactic of challenging an enemy and leading him on a merry chase around the battlefield, remaining just close enough to re-issue the challenge every round, while more straightforward, challenge and duke it out with the mark in melee paladins can maintain the challenge for free and use their minor action for Lay on Hands and Channel Divinity.
This broadens the archetype of the paladin slightly - paladins of trickster gods, for example, could make use of the tactic of challenging an enemy and leading him on a merry chase around the battlefield, remaining just close enough to re-issue the challenge every round, while more straightforward, challenge and duke it out with the mark in melee paladins can maintain the challenge for free and use their minor action for Lay on Hands and Channel Divinity.