Duplicate Products / Services
I think it would be really useful to add a new feature to duplicate a Product / Service. A lot of the time especially with web hosts only a few values need changing service to service.
Adding a duplicate Product / Service feature to the software would prevent retyping the same stuff over and over again for each separate product / service. It would also ensure no minor errors are made while retyping for each Product / Service as they will obviously same as the duplicated one.