Yeah, I've mentioned this one a few times. It's really annoying cause what is happening is the first click brings up the city UI, and the second click assumes you want to build the topmost highlighted building from the build list.
I definately agree that double-click should bring up the city details screen.
I strongly recommend that the build list NOT have the top item highlighted so that there is no chance of accidental builds. There are times where it is possible that an auto build covers your only forest tile, thus forever removing your chance of building a lumber mill. Scary.