Not much time to respond as I wish to have, but, well, time will be soon different.
I did resize most models for every field, the problem is that this is stored in the flevel.lgp itself. Though, thanks to 7H, I was able to extract only the necessary part - the model loader. While this is widely compatible with all languages it isn't compatible with mods, which do actually alter the model loader of the flevel.lgp. I assume that NT and the Reunion mod will have some problems with this. If you want to alter the size for that scene by yourself, you need Makoureactor. With it you can alter the size for every model and somewhere (walkmesh -> miscellaneous -> field scale) is also a setting, which defines what the normal size of a model in that scene is and gives the model the correct movement speed.