For now: You could save those queries in a Filter (Menu:Search > Organize Filters)
I have a quite similar rule (called it NoNonsense) and made that my default filter (Menu:Tools > Options > Home: Filter = NoNonsense)
Now, when searching, I get only relevant results.
When you have to search for something that was blocked by my filter, switch temporarily to the Everything filter.
The thing I like best with these filters, is that they don't clutter your search box (otherwise you could also use a bookmark).
(No, he's saying that specific dialog "input" box is [too] small.
As you're already doing, copy & paste would be my method.
After all how big "should" it be.
Yes you could have an expandable dialog box...
Maybe a hotkey, F8, that opens an "editor" box, perhaps even multi-line, where you could type/paste your strings...)