No ability to extend Lane in all 4 dirrections

I have a small business process and all nodes are placed on top of Lane

Now when I need to do any change on the right side or bottom, I can simply resize Lane and place new nodes. But when I need to place any new node on top or on left side, then there are no way to resize lane from top right corner. In such case I would need resize lane on bottom-left corner, move all nodes,  place new nodes.

Request: give ability to resize node in top left corner in addition to bottom right