u r rite yanyewkay, dependz on how 'chim' d slave flash.
some can zoom, set power level, do strobez, norm tilt up-&-down & left-&-right, etc....

but i hav no idea where u can tie it 2. thou u can do test shots 2 determine wad power b4 d event proper, direction 2 point d flash 2...