You are correct that the behavior of toggle supercontrols with a non-zero minimum and "send on only" is odd... if the minimum is not zero, the min sends anyway.
However: why would you set the minimum to something other than zero, since it's not going to send anyway?
We're trying to understand the use-case for this before we consider it a bug. Until we do, it's just an oddity.
Thanks for your continued enthusiasm for MD.
Best!
Dan