Expenses - adding non-labor expenses with a % markup

You currently can add expenses in Intervals and keep track of what it cost you vs. your client. Here is where Expenses are located:

Go to Projects > Pick a Single Project > Expenses is located in the left hand navigation:

Project Name
* Profile
* Dashboard
* Time Summary
* Estimated vs. Actual
* Payments
* Expenses
* Project notes

The expense is what it cost you the Fee is what you are charging your client.

Is there any way that you could possibly add an estimated expense cost? This would helpful for us to be able to add expenses in the estimating phase and then once we get actuals be able to see where we were on budget or over/under budget.