theres nothing wrong with KR managment, in fact if you run the ABF on KR mangement it'll be faster than it would be using the stock ABF managment

Of course you can get the ABF remapped to bring the performance back up, the ABF managment is more tuned for economy than performance, with KR, the opposite is true

Plus if you already have a 16v MK2, theres no point ripping out all the managemnt and putting in the ABF stuff, when you can just chuck the ABF block in and plug all the KR stuff straight into the block, much easier.
Have a read of Toyotects posts, the ABF+KR managment offers the best out of the box performance, he only managed to improve it by going megasquirt!