Garthanos
Arcadian Knight
I also feel like this is a complexity reducer. If a player really just wants to do some few specific things mechanically, sure its 'spamming', but why fight them? With 4e as it is today you can always find 3 powers that are effectively identical anyway. I'd rather have one power, maybe one that can actually vary based on different weapon riders for instance, that keeps the character sheet simpler and cleaner and lets you only introduce DESIRED complexity.
Right I would rather fight doldrums of spamming by making things more like rock paper scissors... and also situationally advantageous in a common set of situations... than just forbidding spamming