Standard Photo Crop Sizes for Photographers

[drdavidknox]

This is bugging me. I have been using Lightroom since it was created but I have noticed that there is no provision for Standard Photo Crop sizes, Why?

Professional photographers are bogged down with color corrections and such, this feature should have been standard from jump-street!

We need crops for the following:

4x6
5x5 
5x7

8x8
8x10 
11x14 
12x12 
12x16 
12x18 
16x20 
20x24 
20x30 
24x36

30x40

[Rikk Flohr: Photography]

The only aspect ratio you've listed that isn't currently available as a preset is 11x14.
All other ratios are in the existing preset drop down. 

Example: 
It would be redundant to have 2X3 and also have 4x6,12x18, 20x30 because they are all the same ratio.