In the OBJECT/TRANSFORM EACH menu add width and height options besides Scale and Move. That will be useful for resizing to a specific width or height several objects with different dimensions, like images or icons.

我想把不同长度的矩形统一为相同的尺寸，并左对齐，目前用变换面板无法实现。变换：可以设置参考点，但不能统一尺寸；矩形属性：可以统一尺寸，但不能设置参考点。希望参考点对矩形属性起作用，或在矩形属性中增加参考点功能。

I do competitive audits using illustrator. I paste multiple images in illustrator and need to be able to make them all the same height so that I can organize them into categories. Having a way where I could select all of the images and resize them all at once would make this a simple one action process, which would save tremendous amount of time vs. having to resize each one individually. Please make this an option.

For my products it would be a lot faster to resize to the same width or height. I use many objects to laser on different products.

Another solution would be use a free script by Sergey Osokin, Resize to Size: https://github.com/creold/illustrator-scripts/blob/master/md/Item.md#resizetosize

Yes, this makes no sense not to have. And for the comments below, yes, I know there are scripts to do that, I don't want scripts, this is a basic feature, there's the align buttons, you would usually find selection size fitting buttons along with them. When you try to do any kind of checkered things, with different height and width per rows or columns, it quickly becomes a mess.

I agree that Adobe should do it, but meanwhile please use a brilliant script by Sergey Osokin: https://github.com/creold/illustrator-scripts#resizetosize

There're scripts that do that. Search here
http://illustrator.hilfdirselbst.ch/dokuwiki/en/skripte/javascript/uebersicht
in 'azbuka-dtp.ru' section.

When selecting multiple objects - resize all to widest/tallest would be a convenient feature.

Yes, I know that script. But can it scale proportionaly? Anyway, I think this should be default feature

There's a script for that...
http://www.wundes.com/JS4AI/setAllTheThings.jsx

For example I have 20 logos and I want to select them all and set width to 30 px. Hight schould be scaled proportional. The "Transform each" command does not allow to specify a size. So I have to type 20 times the required values for each object.

There is a script that can help you with batch transform, named 'Set all the things':
http://www.wundes.com/JS4AI/

In the "Transform Each" options, add an option to give specific dimensions in mm, cm, px etc, in addition to the current % only.