If you have an employee that has lots of good ideas, they will be more valuable to your company and may deserve a raise, just like they would if they were working for a company that was paying them.
Similarly, it’s okay to negotiate a bonus if bonuses are typical for the type of position you are hiring for. Marketing executives may expect a bonus, but burger flippers may not. A good bonus program should be tied to company performance. A bonus program may not make sense for a company that isn’t making money.