Hi
I would concur with BetterRed. I think putting more weight on the plugin author (DiapDealer) would only increase entropy since it could lead to duplicate existing or planned Sigil features.
If the plugin gets extra features from the author (mamooth?), all the best, they're most welcome. If not, I think it makes more sense here to concentrate on providing more features to the main program, i.e. Sigil., like
- availability for Linux users (nearly done)
- breakdown report for group searches (I said that?)
- ...

and