7search has a lot of shitty traffic, but there is some quality there. ... You can pass the publishers 7search unique pub id to your tracking platform using the ###AFFID### variable in your tracking URL, but it wont tell you shit until you have the feature enabled in your account.
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Yeah I would agree with this and add that you should be doing this STANDARDLY on any PPC campaign. Always make sure you can get the SUBID (or AFFID) passed along in within your click URLs.
That way you can optimize for whatever your goal is and cut away all the other crap that will inevitably just eat your money.