BluerecordingStudios
Sonar X1 has this implemented as you remember and it was one of the best function in whole soft...
Except it didn't work in an organized way like I described. It tossed non overlapping clips all over the place randomly and without maintaining the sequence in which the takes were recorded making it very difficult to figure out what take was what (no notes so you had to audition it all which was very time consuming).
And layers themselves were a bear simply because once you got to a certain number of them they took up the whole screen and got so small you could not edit them properly or even use the Solo/Mute buttons. At first I liked Layers until I started really using them then they drove me nuts. Lanes have thier problems (in X2) but I just find them much easier to work with despite the lack of a rebuild option.
I would however like to see a rebuild similar to what I described. The only drawback would be organizing the notes on Lanes that contained multiple takes but that could be fixed with some kind of Notes menu that allowed you to choose the note of specific clips within the lane.
There are other issues I'm starting to visualize with my method but they could be resolved as well with a little thought into implementation which I'm not going to theorize about today.
Either way thank you for letting us know about how the Lanes are working. Cheers.