There is no cp management as a rogue...
There's buff management where you make sure envenom is up as much as possible or rupture. Of for combat there's also paying attention to SnD. But there's really no "cp management" at all and it really just boils down to "I have 5+ cp I'm going to use a finisher". As it stands right now the hardest thing to manage about it is being able to count from 1-5. Every guide out there. Everyone who has ever asked for help and gotten answers the answer that has always been given is "always use finishers at 5 cp" because of anticipation.
Now there's definitely energy management especially as assassination where you pool energy. Less for combat since it's more of a spam fest. But outside of that for assassination the general rule is to always use a finisher at 5 cp (aside from putting up the initial SnD) and the same is for combat with the exception of always use a 5 cp finisher or always refresh SnD with whatever cp you have to make sure it doesn't fall off.
But aside from the fact that your post makes 0 sense how does cp management even effect cp on target or on the player? It's not like a situation where there's 2 targets up so you can build cp up on both targets and stuff like that. All it does is limits what you can do on target swaps, makes for a loss of dps, and is generally just a poorly designed mechanic. Now, if you could build up cp on multiple targets at once that'd be a far more interesting mechanic and something that would take a lot of management.
As far as it "ruining the class" as the above poster stated.... no. I'm pretty sure he hasn't given any examples as to how it could potentially ruin the class because there aren't. Maybe someone could have made that argument from vanilla to wrath but ever since cata came out and a lot of "cp" based specs have been popping up where all of their resources are on them instead of on the target makes that statement invalid. It's been "tested" and shown that it works totally fine by all the other classes who work like that now and seeing as how none of those classes that have their "cp" on them instead of on the target have "ruined their class" it's safe to say that your statement is 100% false and that you gave no thought what so ever into making it.