This help page explains our shipping calculation settings in detail:
http://www.e-junkie.com/ej/help.shipping.htm
Shipping rules are account-wide and cannot be applied or limited to specific products. However, it may still be possible to accomplish your desired objective by judicious application of shipping rules and/or packaging calculations.
If you could explain in detail how you want shipping shipping calculations to work for all your products, even if you need exceptions for certain products, we can explain what approach may be possible and provide instructions to set that up.
