This is my first post on the forum, so hello everyone!
First, I want to say I love what you're doing with and for the game. The fact that you spend your own time to keep this classic alive is incredible.
This is a game I've been playing since the very beginning of my history with PCs and it gives me a lot of fun till this very day. The multiplayer feature is just life changing.

Now, regarding my idea.
I think it would be very useful to be able to repay a certain amount of money.
CTRL + click allows to repay as much as possible, but there are situations when I would like to have some money left in my account, to not go red. This feature (maybe under SHIFT + click) would allow that. A window could be shown which would require user to enter an amount - less or equal to what is available in the account. However, no more than multiplies of 20k could be repaid (user can enter anything, but game repays multiple of 20k which is just lower than the amount entered).
Kind regards,
Mateusz