I like lanes WAY better than layers but yes the need some tweaks.
My suggestions:
1) Fully and independently expandable just like a track
2) Collapse-able to the same height as a fully collapsed track (why they are so big when collapsed is beyond me)
3) Fix some of the glitchy behavior with the record buttons
4) Have new takes ALWAYS record in a new lane even if there is room in another lane or at least have an option to so it will behave in this manner
5) Be able to move the order of the lanes by dragging them just like tracks
6) Be able to combine lanes
7) Be able to clone and copy/drag lanes like tracks
8) Have a volume control
9) Well I'm sure I could think of more stuff.
Essentially I'd like them to behave more like tracks than they do now and it's quite possible they already do some of the stuff I mentioned but I just haven't learned how to yet.
So yeah... love the lanes but I hope Cake keeps working on them. Cheers.