Hi,
This is something that has been a slight annoyance ever since I started using Madmapper, and all these years I've just been writing down specific input rectangle sizes to achieve something simple: applying a direct-rendered material to a 16:9 surface, so that the entire media fits within the 16:9 area (ex. 1080p).
It would be great if the right-click context menu in the input area had an additional "fit" option: "Match Output Geometry" or "Match Output Aspect Ratio". This option could simply create an input rectangle that matches the aspect ratio of the output for that surface (ignoring surface perspective). Then, combined with "Entire Media (preserve ratio)", this rectangle can then fill the width.
This could be useful to everyone. Thanks for your consideration!