I think that the 'Rebuild' funtion need to be in MoI. If imported curves are not so good -many points, kink, etc -, these need to be adjusted to get good surfaces and solid.
I'm thinking of putting in a kind of object properties panel that would show up automatically in the upper-right corner area when something was selected. It would only show up when you were in selection mode (when you are not running inside of a command). It will take some time to experiment with this though, so that's why I postponed it until v2.