If you think that's all there is to adding 8 ohm capability to an SVT, why don't you just get your SVT modded for an 8 ohm tap and see if it's that simple just to add a third tap and it only costs you $5? I assure you that neither will be true.
Sure, modding ONE would cost a fortune - having an 8 ohm tap on all the production transformers would be a small incremental cost.
As for the rest of your fact-free post, the V4B IS 2 ohm capable
My bad - that's awesome!
and their heads have no problems with 4 ohms loads. Yes, a few of us had problems with the Micro VR and two 210av's, but that was addressed by Ampeg, and my problems went away after the cabs broke in well, and I never had any problems running it with a 4 ohm load in any combination except with two 210av's, and neither did anyone else.
My fairly new Micro VR (not a "peeler", traded one of those fiascoes away) sounds like crap on my 4 ohm GK 212MBE as well as my 4 ohm Acoustic B810. It sounds great on an 8 ohm cab. Perhaps I'm the rare bird that runs their Micro VR into output overdrive like one would a V4B? If Ampeg would like to "address" my lemon they know how to get in touch

. The only Ampeg "fix" I read about decreases the power to the point that it is louder "unfixed" with an 8 ohm cab than "fixed" with a 4 ohm cab. I do have a couple options: run my two SVT210AV's in series (I built a cable for that but cuts the power to under 100w I think?), wire up this heavyarse 400w audio autotransformer I have, maybe even try a HPF to see if that tames it? Then there's the PF500 fiasco - that seems to now be fixed?
I will admit that I'd probably love the new V4B with that SVT212 cab

. Tonight's "amp of the day" at rehearsal will be an Ashdown CTM-30 with a power attenuator on it into a "fixed" Peavey TVX 4x10

. Which reminds me, I suppose that cab would work with the Micro VR - if I get help to haul its heavy arse out of the basement it lives in and then back again

. I'm really spoiled by my 34 lb GK 212MBE, just loaded it up for this weekend's three gigs

. It'll be the backline at an open mic we're "hosting" friday and also a two day multiband benefit we're (different band) running - pretty bulletproof with just an Aguilar TH-350 pushing it (I hope).