Suggestion: alt+scroll in the window to change the quality

That sounds like a good idea! I think scrolling is not possible as there is no way to stop the parent scroll pane from scrolling, so I'm thinking about Q and shift+Q to increase/decrease quality.

Which quality exactly do you expect to change? Is it the quality selector in the top right, or the quality of the existing request of the hovered item?

I think it should change the quality of all item icons, so its really obvious a different quality is selected.

Also the "operator" drop down does not need to be there? I don't think we can make a request of ">rare" quality?

The current buttons also propose a risk if there are more qualities than the standard 5.

I see. I'm thinking about the following flow:
- in the quality selector (top right) add a button "apply to all" -> The new conditions will be applied to all existing requests
- for the hovered item add a shortcut Q/shift+Q -> increase/decrease quality of only this item

The comparator selector is also available in the regular interface and I duplicated it just to be complete. The only restriction is that for any otger comparator than "=" the minimum amoubt is always 0.

Indeed the current lay-out for the quality buttons does not yet support additional qualities, that's a GUI improvement I still have to implement.

I already implemented the latter functionality to change the quality of only the hovered item, let me know how this works for you?