I've used ShareX for awhile and the image editor is very similar to Greenshot. But there is one feature I really miss. I forget what it was actually named, but it was basically the opposite of the current blur tool. Instead of blurring the rectangle you selected, everything else gets blurred / darkened.
If this tool were added it could go next to "Highlight" because it serves the same purpose, it just looks different.

I definitely would find this useful
You do it by blurring the entire image and then using Image from screen on the area you need to have sharp.
This works because "Image" effects like stickers, image from file, and image from screen always have higher priority than blur, pixelate and highlight.
How do you do "Image from screen" within the screenshot interface? I'm not looking to add too many steps to accomplish this. It would be perfect as a single button, might not be worth the trouble if I have to blur, then un-blur another area. And the darkening effect is also necessary in some cases otherwise you have to hunt for the part that is not blurred.
EDIT: Nevermind it's right here. That's actually not so bad. I was worried I would have go through a dropdown to get there. Now I want to make a macro that does blur on the whole screen, and applies a box + image from screen region of your choice in one button. :) but that will do!
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Most helpful comment
You do it by blurring the entire image and then using Image from screen on the area you need to have sharp.
This works because "Image" effects like stickers, image from file, and image from screen always have higher priority than blur, pixelate and highlight.