hi,
ad a) you're right ... because export isn't only for tracks, but also for points, I create "export" directory in Locus root folder
ad b) I don't agree. Many users, together with me, have a lot of tracks in Locus, so I thing that much better is export just that, which user want. Anyway, track handling needs many improvements so any global export should come ... (reasonable wishes are welcome on this theme)