Metatrader 4 Indicator modification

I would like to have the attached regression line indicator to be able to shift back in history. At the moment indi counts for example regression line for past 250 bars( I think from from bar 1 to bar 251) and the shift function only shifts current calculation backwards. I would like to be able to draw line for example from bar 500 to 750 etc. so that the 250 bar period (or any defined period ) is counted from a predefined starting point. This is necessary for system testing purposes. i have also enclosed a pivot indicator that shows daily pivots shifted back in history. i would also like to have this same indicator showing weekly pivots shifted back as Daily pivots are shifted now. this is really an optional project, and I'm not sure how labor intense it is. We can start with the regression indicator and then move to pivot or just do the regression indi which is more important. You can bid for both projects or just for the regression indi modification