So, you swapped an STi 6mt into a Forester? And you think the DCCD is working fine? Interesting. Not saying it is impossible, because it is possible depending on the level of complexity of the swap, but very rare.
However, one thing I can assure you of, is that no factory STi dccd system is working "fine" without the abs system fully functioning and talking to it.
Are you sure you don't have one of my dccd controllers running the dccd?
That's the only way I can think of that you are successfully running no abs and have a fully functioning dccd system.