Autofocus with DSLR and Lens

Hi,

I’m starting out in astrophotography. I have a AZ-EQ6 mount but am using a DSLR (Canon) with a telephoto lens rather than an OTA at this point. Sequence Generator looks really interesting but what I want to know is whether it can control the focus of the lens through the camera connection and hence perform autofocus?

If not, would it be possible for me to write a plugin that could do this. I have a fairly strong software development background so am fairly confident of writing a plugin if the sdk is well documented.