The problem with Vue internal items is that they come from very different sources - and very different time periods of Vue development. So it is not really surprising that they have different scalings, especially because - to say it again - Vue is an illustration program, not an environment simulation one.

However, the "global scaling factor" is definitely something that should go onto the next wishlist - for later Vue versions.

Until then you can do something. You can define basic elements for yourself - terrains, even SolidGrowth plants, etc, and save them in the size you need them further on.

In the latest versions of Infinite, when i have it in mind correctly, you can save scaled plants as species and when you reload them they keep the size you gave them. Maybe you try that out yourself and see. So worst case is that you go through the plant libraries once, scale them once manually, save them as your own species and work with those from then on.

Same with terrains - make some basic terrains in shapes and especially in sizes you need for your day to day work, save them as vob and work with those later. You of course can modify them if you need it with the terrain editor but you do not have to worry about scaling anymore.

One day your ship comes in - but you're at the airport.