Adding to the cart requires it to provide either the bounce page or confirmation page dependant on the shopping mode. Do not think it is possible to invisibly add items to the cart without it going through a portion of this process, which in turn creates the session file additions etc etc..
I have achieved this with a hack in the .pm files, although it's not perfect and does effect some of the other processes (ie bounce page when logging in). If you want I'll post what I've done and you can see if it'll suit your needs.
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