Man I am crazy excited about this stuff. A friend pointed me to your site this year and I was wishing you'd head to modo dev. I just happen to have just purchased Realflow which makes things even sweeter. I'm currently on OSX so I'm crossing my fingers that you have OSX development in mind at some point.
Regarding the actual plugin, it looks super cool. I love that you can animate the sequence over time, it means you could actually do time remapping with the obj sequence if needed directly within modo.
I'm not hyped on the path and file name copy/paste workflow. Couldn't this just be a direct select first object in the sequence type of interface? You could maintain the current method but have an alternate load first object of sequence type deal.
The Effects options are awesome. I've had to resort to displacement to do these kinds of post alterations, your methods seems to be faster and better. The thickness portion is insane.