Thanks for the responses guys. My responses to some of the ideas:

1. katsurahama idea of holding down a key to break movement and chain healing on release sounds really good. I will try this out today.

2. Hex issue. i can make them all stop in a similar way as katsurahama suggested but the dps loss is huge. What i really want to set up but i'm not sure if is possible is for for a single spammable button that will cast hex on whoever's turn it is on the round robin and stop their movement so they can cast it while still commanding the other two toons to IWT with the target and burn through their usual dps sequence. And i would want this to work with whatever screen i was on. Otherwise in order to cast hex (if you dont have Maelstrom proc) u have to stop your movement of all toons. Does that make sense?

3. What is really effective but sometimes buggy is to put chain heal in your normal dps spam button and because your running all the time with IWT in pvp when you have 5 stacks of maelstrom it will just make all toons automatically cast chain which is huge for keeping the team alive. The problem i found with this is that in some situations they won't be running through with IWT like if a paladin is standing still spamming heals and your toons were killing a guy right next to him. Could something be set up do this anyway if u figure you get a 5 stack of maelstrom say every 10 seconds or so, and put a macro of some sort onto the psuedo priority spam sequence to do that?

sorry if these questions sound nooby i am just learning how to use ISboxer and am really enjoying playing around with the key mapping.