hi john
I also have been looking at boost controllers with veri rate fuel pressure contoler so i dont burn my pistons out.
One make i was looking out is a duel valve that allows normal boost to mantained (using standard rover boost controler) but at the flick of a switch boost can be increased without the high cost of the electronic boost controllers.
here is one site that does them
http://www.armval.co.uk/products.htm
all the best
tony g