YES YES YES, I also don't use the closed loop on my Emerald K3, but can still get 40+ MPG without trying hard, but average 28-32 on short run stuff, my emissions at last MOT were as follows, on GREYS T3/34, ported head 0.97% CO, 137PPM, with 200,000 MILES on the ORIGINAL engine(head had been done) bores pistons rings all 200,000 miles old.
This was set up by Dave W(emerald), was not tweaked at all for mot, doesn't need to be, runs 100% perfect, for a road car just go fully sequential, the 4wd cossie that I'm taking to Emerald in the morning for mapping on it's K3 is also going fully sequential.
It's not really an enable thing you have it mapped as that, or not by whoever is doing it, you can have 1 map on fully sequential, 1 on semi, 1 on batched if you like.
I did employ closed loop, to see but it ran better on non closed loop and did just as well on mpg.
If you buy Haynes book number H835 "ENGINE MANAGEMENT" this is written by Dave W, 1 half of emerald, the other half being Karl Luxton.
I've had this conversation with dave before and I use fully sequential.
tabetha