I would be great to have tabbed pls/sql editor. Tabbed by package( or procedure function etc). Now we have tabb by package and body, but it would be grat to add master tab by object! You have something like that in delphi code editor or Eclipse, and any more.
Of course the same improvement could be include in sql editor. Now we have tabbed only results window(when few sqls are runned from one widow), but you can add master tab (like in PL/sql editor) with group of sqlls.
I think it would increase speed of work and help to have regular windows