Enhance Find Company Search by Excluding Specific Countries

Request: Exclude Country in Find Company search. I want to primarily target US companies which is why I add "United States" to the select one or more countries. What I've found though is that I'm missing out on a huge number. This is because many companies have not populated the country field on LinkedIn or have an international HQ listed as the country even though there is significant US presence that would be useful for me to target. Given this, having the ability to hard exclude known geographies (countries) that I don't want to target will allow me more easily deal with the remainder. I'd rather have some false positives to sort through than excluding lots of viable prospects.