[Hall of Famer]

Well the old cash mod was developed by Cybertrash/Seapyramid. It did have a donate/send cash system, even though it was not quite noticeable. The new cash script was made by Arianna, it seems that she did not add an equivalent donate/send money system. It can be added in future, the old cash system was quite glitchy though since you can technically send negative amount of money to other users and thus 'steal' money from them.