Add-on to wordpress plugin

Add-on to additional wordpress plugin - add front 9 holes total score, back 9 hole total score, and 18 hole FINAL total score to leader board. [login to view URL] - create user profiles linked to the plugin creating and recording stats to profile. - show last 4 rounds played on profile, creating a average score. MAX score is 105. Using that average create a "handicap" of +/- score of 90. ex: if a players average is 91 they would be -1, if a players average is 82 their handicap is +8. Use 90 as base score. round up if average is .5 or higher. player handicap of 82.5 would be 83 creating a handicap of +7. see example [login to view URL] - these are examples of what I would like done. I currently manually enter in all numbers. I nee a plugin that will auto calcualte all this by players entering in there score. [login to view URL] - attached is the current plugin used