I changed my mind for a few reasons.
1) Tweaks aren't suitable for this in the face of multiple libraries. I can see someone wanting to show #bar in library1 but not in library2. I didn't want to invent a syntax for lists that select libraries.
2) As BetterRed pointed out, typing lists of lookup names isn't easy, especially as a restart is required for every attempt.
3) Maintaining the tweak in the face of column additions and changes isn't easy.
(I see on rereading BetterRed's post that he said all of the above.)
Preferences / Look & feel is the right place for this. That said, I am not totally happy with it. The dialog looks rather empty. Eventually other stuff might go there.
Samples:
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