Please provide possibility for placing other kinds of orders, in particular a Sell Stop order. Limit orders are there alright, but Buy Stop, Buy Stop Limit, Buy to Cover Stop, Buy to Cover Limit, Sell Stop, Sell Short Stop and Sell Stop Limit all would prove much useful, they are all valid stock market orders; and if this is meant to be a realistic game (I assume it aims to be, that is why it mirrors the real-life trade prices and sizes,) it would be just the better to support all what the stock market can offer. Sell Stop orders are a great tool and protection for people conscious of not wanting to risk more than a certain amount in a trade.
Please consider
Peter Sisak