Hey Sheldon,
There has been a mention of this enhancement around the forums, but you didn't address it and I would like to know your thought about it. It is regarding the pickup selector switch, primarily on the AB line but might also be applicable to Z1s and PAs.
As you probably know, Funkshwey installed a series/parallel switch for the neck pickup on then his, now mine AB-II. I feel that switch is generally best left in the default, parallel mode; however, when soloing the neck pickup, wiring it to series has become mandatory for me - the sound gets so chunky and powerful (although more noisy), switching back to parallel literally makes me frown. Although I don't want to speak on his behalf, I understand
Funk feels the same way - so I ask him to chip in.
The actual enchantment is having the pickup selector automatically switch the neck pickup to series when soloed. Given you use FD-3 4Ls that seems possible. What is a problem, the 2 pickup selector becomes, in a sense, a selector between 3 pickups which might be more expensive and difficult to produce. I wish I was more electronically canny, so not to waste your time if this is too complicated to be practically feasible. I, personally, would pay to get this option installed. I love my series-wired neck pickup soloed, but it's too dominating otherwise to be put in series permanently - this enhancement is the ultimate solution.
What do you think? Even though the production process might need be altered a bit to do the extra wiring, it's possible it would only marginally increase the production time; but would definitely add a point to versatility, given that the neck selection would be more discrete, set apart from others.
I realize that every now and then I post a suggestion. I hope I don't bore you

Regards,
Bo