Ver 1.2.2, Sync tab.
In the Folders and Extensions to exclude area, it appears as though Toucan's not targeting *specific* folders, but is simply comparing all folder names to those particular strings & discarding anything that matches.
My example is if I want to leave out my \TrackMania\Skins\Avatars folder, I can't simply enter that string. I have to just enter Avatars & hope that's the only folder named Avatars. If I do have multiple folders named Avatars, they're all excluded. If I put in the entire path, it appears that line is ignored.
Is it going to stay that way? I think it'd be far preferable if I was able to match on specific folders rather than all folders with the same name.
version 2.0 (which is currently in Alpha) the whole exclusions system has been hugely updated and will now do what you want with out any trouble, expect to see in in prerelease in the next couple of months.