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What if you were able to enter simple math formulae into any number-entry box? So if you were resizing an image, for instance, you could enter '=1024/6' for instance. It would be useful pretty much anywhere you'd be otherwise copy/pasting an answer from a calculator or KRunner, and save a couple steps. Plus it's not something that would ever really get in the way if you didn't want to use it.

What would be extra cool would be if, say, you could reference values from other entry-boxes on a dialogue/page by referring to their buddy label's hotkey letter, or something similar.

why only number-entry boxes and only math operations??

1) developers not allways sets up entry type corectly, leaving it as a text input
2) using exel/calc style phrazing could do string opeation too

I was thinking that only number-entry boxes would be the most hassle-free because the only input they normally accept is numbers, which makes it easy to use whatever markup necessary. In a text-box, a user who knows nothing about this feature might accidentally trigger it's use by whatever they type in the box (i.e. not using a escape character on a special character) and get quickly confused.

Many Line-Widgets already have a "clear" button. There could be a second button or a contex-menu-action for opening a small popup under the widget (like the popup for recently used input-texts). There you could also input string-formulas. And there would be enough space to display recent results.