Now, it doesn't have to be the removed paladin ability, with it's melee attack aspect. High Elf priests are confined to a custom patch, and that means that they could have a custom spell that merely mimics Crusader Strike's debuff, while otherwise acting seperately. Here's what I propose.
Obviously higher ranks would do more damage and have a more potent debuff (the removed ability ranged from 6-30 added damage per stack), but what does this change compared to just giving it to paladins? For one thing, it does not immediately make paladins the strongest dps class in the game by virtue of giving them a spammable attack(which also lets melee hunters retain their gimmick of best proc fisher), but gives them a boost in pve while remaining relatively the same in pvp. As it increases all holy damage, it's the perfect supplement for a smite priest, and it's self contained. The 15 second cooldown means that a single high elf priest will take over a minute to get the debuff to full capacity, but five priests working in concert can see results much quicker, which is incredibly flavorful.Crusader Strike (Ranks 1-5)
~ Mana 30 yd range
2.5 sec cast 15 sec cooldown
Smite an enemy for ~ to ~ Holy damage and increases the holy damage taken by the target by up to ~ per Crusader Strike. Can be applied up to 5 times. Lasts 30 sec.
Crusader Strike, especially reworked in such a manner, gives high elf priests an alternative to simply stealing fear ward from their stout compatriots, and opens up new gameplay styles in the process. Of course, priests are allowed two racial spells, so theoretically they could have both. ;D
Please consider this exciting idea. I believe it's a nice compromise between paladins getting crusader strike and being ridiculously powerful and not getting it at all. More importantly, it gives Smite Priests a fun new toy that we'd love. <3