Move or add cancel buttom to top of screen/invoice/window

I was recently advised that in order to avoid locking (pick a subject), that we should hit CANCEL at the bottom of the screen instead of the X to close the window. Could the CANCEL button be added to the top of the screen to avoid having to scroll all the way to the bottom when reviewing items? This is an inefficient use of time when having to double check items, say several invoices, for an issue and having to scroll down. The Next and/or Previous aren't always available, but Cancel often is.