At the moment of writing (v0.8.11) I am working on v1.0 which will likely have a better user experience for the Stereometer. But currently resizing it is only enabled past a certain size as you said as it will simply clip off the edges losing you some information. The Stereometer has a fixed aspect ratio of either 2:1 or 1:1 depending on the mode.
I am curious what other modules you're looking for in here?