My suggestion is regarding the "Straighten Tool (A). Double click to straighten automatically" under Crop & Rotate in Adobe Camera Raw (probably pertains to Lightroom as well). As of now, you can straighten multiple images at the same time, but this works only for series of images with the same tilt angle (e.g. I need to straighten all images by 15 degrees). However, ACR does not recompute for different tilt angles, only copies the change in the main image to the other ones.
Unfortunatelly, when you are editing hundreds of images that are all tilted under different angles, you have to double click to straighten for each of them separately. Double clicking the Straighten Tool is by all means a time saver in most cases, but having to do this with each image is quite time-consuming.
I understand that automatic straightening of dozens or even hundreds of images might take a big amount of computing power, but it would be a great feature to have and would save a huge amount of time.