Good evening there

So it's been a while since I last played with more then a single character, last time was back in wotlk and back then, even though I had ISBoxer i bought it near the end of my multiboxing period and so already got too use to using /click and caseqence macros with ",,,,," back in wotlk

Now am back in Cata and realise the method of this pause in macros has been stopped and so I feel that maybe digging more deeper in what ISBoxer has to offer in features is the only option.

Anyway ... on to my question!
I started trying to 'macro' a rotation for a warrior tank but this proved to be somewhat hard to do and am not sure on how to go about this.

I don't know if it's possible but firstly in ISBoxer, is it possible to say have it how a /click macro used to work?

Right now i only know of using steps in key maps
So it would be Charge (1.5 sec) >>> Shield Block (1.5 sec) >>> Shield Slam, Revenge (1.5) >>> Rend (1.5) >>> Dev....
Anyway basically, the cooldown on rend is 15 seconds-ish, i don't want it appling again untill 15 seconds
Same with shield slam, only want it applying every 6 seconds.

But making a long list of actions to make sure the shield slam is pressed after 6 seconds each time by calculatiing when it should be pressed in a sequenced of spells seems, well a lot of trouble

So is it possbile to just get ISBoxer to press the shield slam and not go back to pressing it untill 6 seconds has passed? if you know what i mean ...

Just to be clear ...
If theres spell 1, 2, 3 and 4 ... where spell 2 has a 8 second CD
Is it possible to setup so it presses spell 1, then spell 2, 3, 4 one after the other (1.5 second for GCD between each) but when it comes back around it skips pressing spell 2 again because it's asigned not to be used again untill the 8 second mark is complete.

Thank you for any input or suggestions