Mr or Mrs.Kek91 All of these ideas
- An organized crime with multiplayer functionality (i.e. when clicking on the OC icon you will see a lobby with online players and you assemble a team of 4(?) players to do a bank heist)
- More complex management functions for properties/businesses
- Drug dealing/smuggling
- Cities (drug prices will vary from city to city, and flying to another city can reduce heat, etc)
- Domination, every city has its own map with 10 plots you can take over
- Kill function for bots
- Missions (i.e. "Kill this bot from the hitlist, rewards money")
Are really good ideas you should follow through with them.