Right now its possible to interpolate between two effect parameters. What would be cool would be if you could just insert a line with arrows between two effects, this means that its interpolated automatically between the effects. So anytime you change any of the effects or move them up/down you don´t need to reinterpolate its just calculated on the fly.
Different types of graphics could be used to show what kind of interpolation there is between two values.
Like interpolation in flash.