I went with a command instead of modifying the panel, it's simpler.
Use /groupreward <player name or all> <amount of money (amount is multiplied by online group members if 'all')> <reason (optional)>.
- Added '/groupreward' which allows leaders to easily 'reward' group members with money. Money is withdrawn from group bank. There's a confirmation too so be careful before rewarding. (Danzy + R9)