Exact match for quick admin search

Hello, i'm admin of huge forum with over 100k users. When i try to find somebody in quick admin search (i know full nickname of wanted user), i enter nick to input and get a lot of results, because wanted nickname is non unical, i can't find him in first 10 (or 5, i don't remember) lines, because engine filter results in letters (not relevance), i want to see wanted nickname in first line, i suggest 2 ways:
1. Do a "exact match"checkbox in quick search
2. Use relevance searcher