Flexible borders in grid

Make borders in colums, rows or grid flexible to move right/left/up/down. For ex: in grid moving the top vertical border from group 1 and 2 (top) a bit to the left, but vertical border of group 3 and 4 (bottom) stays in the middle.

Nice too, to get one side 2 rows in a column and other side just one column (just thinking that)