I am posting this on behalf of someone else: I do not play D3 but I do play WoW so what I do know of game macros stems from that. It would be appreciated if any suggestions are derived from successful testing as I will just toss him links to these threads.
He is asking for a war cry macro that essentially triggers every time it comes off CD-- or whatever will help in keeping 100% up-time, I assume. I know that this might be more difficult if this spell triggers a GCD or if it would have to be a part of a cast sequence (worse-case scenario). If it's a script that he has to tack on to every ability or a spell that shares the same CD or just an ability that could logically pair well with the buff, that will work. If all else fails, if any sort of addon exists, similar to the ones WoW raiders use to remind them when their spells are coming off CD, that could work as well. If you want to toss in any explanations as to why something works/doesn't work; is/isn't efficient, that will likely be appreciated as well.