Bob,
We aren't going to be enhancing the Serializer servo functionality, but we are close to launching a new product called the "ServoWizard", which will feature 25 servo channel control (speed, and distance), via an I2C interface. Thus, you will be able to plug it into the Serializer, and use the Generic I2C interface to use it.
It will be similar to the SSC-32, but since it's I2C, the interface will be a little different. :) You will have the fine PW granularity of 1msec though, and you will also be able to time the move for each channel.
We have the ServoWizard boards in stock, but we have to finish the firmware. We keep getting interrupted by order fulfillment, so it's hard to get back to the fun stuff! :) LoL
We're hoping to get the ServoWizard launched in a few weeks, but I do have some pressing jobs to finish that have a higher priority. So, it may be right before Christmas before they're available.
Best Regards!