Adobe Illustrator, after I do
S to open the
Save For Web & Devices window, is there a keyboard shortcut or other way to select the
Image Size tab in that window and input size without using the mouse?
Not that I know of. But if you need to repeat the same process of Saving for Web and Device and changing the size I would suggest recording an Action to do that for you. You can then either play the Action every time you need it or do a Batch export.