Easy way to match the column position in a view definition to the selected column. For large views, it is often difficult/time consuming to find out which column in the view definition corresponds to which column in the select statement. This usually involves counting its position in the definition and then counting down the same number in the select. Not a problem on small views but on some of the larger ones (particuarly in apps - mtl_system_items_vl selects 341 columns!) this can be an annoying and can often lead to picking the wrong column when the selected columns aliases don't correspond to the definition column names, or there are several subqueries.
I think a useful addition would be that if you place your cursor on a column alias in a view definition then by pressing some key (ctrl etc), the corresponding column/inline select is highlighted in the select statement.
CREATE VIEW v (c1,c2,c3,c4,c5) AS
SELECT x.y,x.z, a.b, a.c, a.d FROM t;
To, if I placed my cursor next to c3 above then something would indicate to me that a.c was the corresponding column. Perhaps colouring the background, highlighting etc...