We apologize for the instability of composr.app and appreciate your patience. We are working on the statistics addon and trying to find an optimal way to store and render data. Unfortunately, we have yet to find a solution that can handle the traffic (and therefore, tens of millions of statistical records) of composr.app. We're working hard on one.
Generally not everything is going to work through Commandr. Certain tools are best done via a web interface because of the need to stream a download or interactivity or being integrated also via AJAX. Certain tools are best done from SSH due to long run time, or needing special permissions, or potentially breaking the site (so needing running outside it).
We now have the professional upgrading tutorial which provides a great deal of advice.
Also the codebook provides an index of tools.