1:  I've felt for a long time that pop-up messages like "there is already a trade route between x & y" should be suplemented or replaced by a message on the left edge of the screen that we could click on and it would jump to the spot, like so many city messages.

But the clincher came (in 1.19f) with a message saying something to the effect of "your caravan cannot find a route back and cannot set up a trade route".  Sorry, don't recall the exact words, but it did not include the city names, so I have no idea where it was.  Please add a clickable message, or at least give the city names.

2:  While I'm bitching about caravans, how about fixing the issue where if you hover the mouse over caravans, you still see the info on the 1st one when you move the mouse over the 2nd one, etc.  That's been mentioned before.

3:  When I hover the mouse over a caravan that is on its way to set up a trade route, I'd like it to tell me which city is it going to, in addition to or instead of the tip that I can select a city for it to trade with.  After all, I have already selected a city for it.

4:  In the city distplay I'd like the trade routes or caravans section to give some info about trade routes that are being built, but not yet operational.

5:  Caravans that are genuinely idle (like those that just got the already-have-a-trade-route message) should count as idle for the tab key / next-unit button.  But only truely idle caravans please, not those that have been given a destination.