Hi David,
There is a possible way to customize alert messages for public monitors, such as our LTM Pool Member aggregate monitor (F5.LTM.PoolMember.Monitor.AggregateMonitor), but this is not a very straightforward process, especially for a sealed management pack, like ours. It would require some XML authoring skills and a bit of a SQL query knowledge. I will try to scope the steps out for you, and this will probably make it into a blog entry, which I will try to post in the next 24 hours, as the span of this forum would probably be limited for such an article.
I will get back to you here and link the blog post, for you to follow. Bear with me a few more hours and I will try to get the answer for you.
Thanks for your patience and for your interest in our management pack.
Julian