Timesheet + Invoice issues

I am just exploring Zoho Timesheet and Invoice to see if it fits our needs.

1. Is there some way to enter timesheet start and end times using 12 hour clock and AM/PM?

2. From other messages I gather that displaying start and end times on the invoice is being worked on. Any estimate for completion?

3. When creating a second or subsequent invoice, I see that the invoice feature shows a message alerting (correctly) that there is an unpaid balance for a previous invoice. How do you make that unpaid balance (or for that matter a prior over-payment, or payment-in-advance) appear in the new invoice?

Thanks.