Eventually we will be merging the client tickets with the global tickets code, only difference is if accessing tickets from the client section you will only see that clients tickets. This way we only have to work on updating one code base.
We plan to do this across the board Recurring Tickets, Invoices, Quotes, Vendors etc. It doesnt make sense to maintain 2 codes that are almost identical, and will allow features to be spanned in both areas not just one.