This request has nothing to do with the maximizer. As Bale pointed out, automatic familiar item switching occurs whenever you switch familiars, the new familiar is not already equipped, and you have a "suitable" generic familiar item in inventory. The list of "suitable" generic items is hardcoded and hasn't changed since long before Beecore rolled out.
The interesting thing (to me) is that none of those generic items is something you can get in-run (well, except for a lead necklace) except by intentionally pulling it in a softcore run. Beecore drops when you free the king. You have a hookah in inventory and you've not freed the king yet? You intentionally pulled it.
I recently finished a series of 10 Softcore Beecore runs - my first Softcore runs ever since ascension (except for one misclick early on when I failed to select Hardcore). On my first run, I was so proud of myself: I pulled a hookah so that ALL my familiars would be boosted!
It took 1 battle before I realized my error. It took about 5 battles before I realized that I just didn't want to deal with it and closeted the hookah.
I see 3 possible responses:
1) If you have a hookah (or other generic B familiar-items - mayfly bait, box of fireworks, ...) in Softcore Beecore, it is because you intentionally pulled it. You do not accidentally have generic familiar equipment in Beecore that KoLmafia will automatically switch for you. You pulled it and thereby made it available.
If you pulled it, you intended to use it - and KoLmafia will oblige. You don't want to use it? Put it in your closet - and think harder next time before you pull it.
Which is to say, the status quo.
2) Simply filter out B items when considering automatic familiar item switching in Beecore. No maximum Beeosity. No preferences. No maximizer.
3) You want a preference? OK - enable or disable automatic familiar item switching. People have been complaining about it for years, but either we got it working well enough or they have given up in exhaustion. Our former attitude was "more preferences = more confusion" and resisted adding preferences for every little detail of operation. We've relaxed that attitude since.
I'm inclined to go with #1 and say "if you have a hookah or other generic B-item in a Softcore run, you intentionally pulled it and it is fair game."