Setting an affiliate share to 0% is the same as disabling affiliate sharing/tracking, so that won't work for what you're wanting to accomplish. However, you can set up a regular Affiliate program with normal % shares, and then join your own Affiliate program by clicking your own sign-up link (your existing E-junkie login will work fine for this) and get your common or product-specific Hop Link codes to place on those other sites where you link to your main product site/pages. To track which links resulted in which sales, you can add &aff_custom= to your Affiliate link URLs as recently described here:
http://www.e-junkie.com/bb/topic/2309#post9468