I've been using Zoho Invoice for ages, but recently started to use the "Expenses" functionality. It's very good, but it has a few missing things, which would make it even more useful, so I thought that I'd propose them.

1. You already have flags for 'billable' and 'invoiced', which is great. However, for internal reporting it would be very helpful to be able to flag an expense as 'reimbursable' and 'reimbursed', since some expenses will be made by staff out of personal cash (rather than on company credit card) and I'd really like to be able to run a report to see how much cash needs to be paid back to staff for their cash expenses, and what has already been paid back.
2. It would also be very useful to have a field for 'payment method' e.g. cash, credit card, and so on.

Mark