using a Label and using the left widow to go this label is not solution. Bookmark is more more more different. When you compile your code, the labels will be compiled by the compiler. But Bookmarks wont. The bookmarks are used only editing time by the editor interface.

sometimes, suing Left Object Inspector Window is not useful to write speedy code. You have to use the mouse and your eyes to watch for the left window area for labels, variabels, consts... But you dont have to use the mouse and your eyes for the bookmarks and also you can be more speedy.

(I dont like using mouse when I write code)