I would like to trigger two 430ex flashes with my 7D and expose using ETTL. Haven't bought the second flash yet but can get one used for under $200. Now the only way this appears to work is by setting the on-camera flash to ETTL (which I could trigger using manual setting at 1/64 or whatever the smallest setting is). Thus, even if I give it a low ratio, I will still have some head-on light. Is this the wrong way to approach this? The second flash would also come in handy for my XTi my wife is starting to get into. Thanks.