Thats possible, certianly something that can be configured, albeit in a clunky kind of way. If we have enough affiliates who are interested in doing this, something better could be built.
If you are thinking about some uber system that controlls multiple affiliate programs and multiple sub accounts – that would be something harder. The top end software out there for media management and PPC management actually does that – manages several different Online Media systems – aggregating the stats, Atlas is an example of that for PPC. Expensive but works very very well. This can happen because all the different media owners co-operate on formats and stats.
I’d say if there is demand out there, its only a matter of time for something to be built, but you would need uniform standards for stats and co-operation.