SmartSVN is simply working...
The Plugin-API allows to extend SmartSVN the way you need for your work-flow. It's currently only available for Enterprise customers.
What can be done with the Plugin-API:
To see if the Plugin-API will allow to customize the workflows to your needs, you can request a 31 days evaluation license-key below.
The Plugin-API demo license requires SmartSVN 6.5.3 or later. If you have already a Professional license, you will be put back into demo mode, hence we recommand to have a second, temporary installation of SmartSVN to test the Plugin-API: On Windows, use the Portable bundle, on other operating systems set smartsvn.home to a new, temporary SmartSVN configuration area.