Sometimes a tab on the left and a tab on the right are a pair, i.e. you only want to see those two together.
So, say you have 4 tabs on the left and 6 tabs on the right. If each one of the 4 left tabs had a right tab linked to it, it would be nice to be able to have the right display automatically switch to the proper right tab whenever you switch to a different left tab.
Thanks for the idea.
At the moment you could do that using styles or buttons rather than folder tabs, but that is less dynamic if it's something you envisage needing to set up on the fly rather than something you need for a fairly static set of folders.
+1 for the idea though...
I have several folder tab groups which I "pair up" for certain workflows, where I'll click a button to begin work on something, which will switch me to dual display mode, and will load both a top/left and bottom/right set of related tab groups as needed. Most of those groups have the same number of folder tabs opening on each side, where the first tab on the top/left display is intended to be "paired" with the first tab on the bottom/right display, second, third, and so on. I could maybe envision a more complicated mechanism that could arbitrarily associate specific tabs across displays without any reliance on folder tab 'position' (particularly if you have a different number of tabs open in one display vs another). But I think a simplistic way of "pairing" the "selection" of folder tabs between displays that would still be useful to some, could perhaps be just based on folder tab 'position' and enabled by something like a new 'set navlock=foldertabselection' command, or maybe just a Prefs based option to enable some qualifier key combo on the mouse select of a folder tab - like Ctrl/Shift/Alt + Left Mouse click - to activate synchronized tab selection across displays.
Like it!
I like the idea, but I think it might be too difficult to configure all those pairs and take too much time before actually getting any benefits of that feature.
Well, that'd be true of the "more complicated" way of implementing this sort of feature... where you could explicitly "link" tabs between displays regardless of their position on each displays tab bar.
What I was trying to describe that I think could still be very beneficial - but without that specific level of control, would be to have a much simpler implementation that wouldn't require you to explicitly link particular tabs at all... Just a single command or option that would quite simply link the activation of a tab between dual displays based on relative position; like:
...where (after enabling such an option), clicking the tab for folder "3" on the top display would also activate folder "c" on the bottom display. Clicking folder "5" on the top display would activate folder "e" on the bottom display, etc etc etc... so no explicit "configuration" necessary with such a method. If I'm Jon or Leo though, and entertaining the idea - then I'm getting ready to ask things like what happens when there are different number of tabs in each display, etc 
.