It's not working as intended for me. I have a agi potion, Lucky coin, bezerk, and incarnation on my burst key. It will use the potion and beserk and sometimes the coin....but when it comes to incarnation it's like the routine skips over it and dosn't pause long enough to get it off so I have to spam it a billion time to get it to finally cast.
The problem is incarnation uses a GCD, the others dont. So while the CR is doing its normal rotation in the background, when you hit your burst key it can activate all the off cool down stuff as expected but likely the CR is busy generating combo points shreding etc so it wont be able to use incarnation. If you wait until its idle pooling resources then you wont have an issue, but what i have been doing is manually incarnating then hitting burst key so I know everything will be activated when i want it