FlyingForFun I am misunderstanding you.
you can either do the CPL exams and the IR exams (and end up with a CPL/IR), or do the ATPL exams (and end up with a fATPL)
is absolutely no reason why anyone would want to do both the CPL exams and the IR exams - you will end up having to do a couple of exams twice, and therefore have more work to do.
But you just said that you could do the CPL and IR exams
So the only sensible way of doing this is to do the ATPL exams - so there is no question that you should aim for a "fATPL" if you are going for a JAR license.
Totally agree. I would expect that anyone just sitting the CPL exams and not the ATPL exams would be a wannabe flight instructor for example, and would have not interest in getting in to the airlines.