Perry,
may I draw your attention to this from the post above:
I also understand and can map - from scratch - certain modern OEM ECUs like Bosch Motronic which are several orders of magnitude more complicated than the most sophisticated aftermarket ECU.
With regards to sequential, it may only have two injector drivers as std, but the software support is there. One of the first things i did on my old CVH was put in Jean's peak and hold 4 channel injector board. Very easy add on and you now have 4 channel seq.
However, i have never needed it on the engines I've mapped. The control over large injectors is superb - std CVH's on grey's that cruise at 1.1 and idle where ever you want them, with excellent response. There is the potential for more economy and off idle response with seq but most people wouldn't notice it.
Rick