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It would be very helpful to add a billing rate for each user - so that when you run time reports you can see the amount of money spent on the task or project.
Example: Bill (Manager), Rate $25 per hour, Jenny (VP), Rate $125 per hour
Project X Report:
Bill - 4hours ($100)
Jenny - 2 hours ($250)
Total 6 hours ($350)
We actually plan to offer cost tracking features to AceProject and billing rate will probably be one of them. Your suggestion will definitely be considered for future development.
In the meantime, a workaround is to create "Time Types" to reflect each hourly rate and manually calculate work hours accordingly. You might want to use codes, for privacy. Each time type may be given a description(in this case, each code's monetary value), which can be viewed by administrators only.
For instance, your time types could be:
Of course, each user should be asked to enter a specific time type every time they fill a time sheet. Hence, by generating time reports (to track actual hours), you will be able to manually calculate the total amount of money spent for their services. For instance: