No...as many have mentioned, Apple has made the decision not to implement the 'Cut' feature because the 'Cut' action has always deleted what is being cut and put that thing in memory until it was pasted. This behavior, while not so devastating in a word processor for example, could be very disastrous in a file manager environment like the Finder. If a user cuts a file and forgets to paste it elsewhere and even if the Finder could 'undo' the mistake if caught early, he could completely forget, restart his computer and lose the file forever.
This is not the way Windows' 'Cut' feature in Explorer works...Cut in Explorer will temporarily gray out the file to show that it's being cut...but if the user forgets to paste the file, the file isn't deleted. This solves the problem but makes the 'Cut' feature inconsistent with it's normal known behavior of deleting the selected object.
I, however, think Cut could be added to the Finder if there was a sufficiently powerful 'undo' history for the Finder and considering Time Machine is now available to anyone. I used to be very much against the idea of having a 'Cut' feature in the Finder but now I'm very much for the idea since it will be harder to completely lose a file.
As for the idea of allowing files to be renamed in the Open/Save dialog sheets? I'm still very much against it...an Open/Save dialog sheet is not meant to be a file manager...but simply a file browser. It makes perfect sense for a file manager like the Finder to allow such things but no sense for a file browser to allow this...*no non-file-managing apps* should allow a user to mess around with existing file names ever.
Besides...adding such things to the Open/Save dialog sheet only creates an unnecessary level of complexity that is already handled by the Finder. If the Open/Save dialog allowed you to create files (other than the file being saved), move files, or rename files, there would be very little need for the Finder. Same with Quick Look...if Quick Look allowed people to edit the document they are looking at...why have apps to edit them?