You asked for some examples of sceneries that I have that have custom ground textures that don't do what I was explaining. Here they are: FlyTampa St. Maarten, Imaginesim KCLT and TJSJ, Sim Giantes Gran Canaria International Airport, Aerosoft Madeira X, Aerosoft German Aiports 2, BluePrint KDAL.
That's only confirms what I've said: they are either much smaller, not supporting rain, or just lower res, or simply bad looking.
From a users end would or could I get a better result if I took the time myself and converted the ground tile textures into .bmp's, joined them, added the masks, and compliled them into a single .bgl
This would mean creating a FSX photoreal scenery. This is how our KJFK and KORD sceneries are made, for example. And, if you followed the discussions after JFK release, a lot of people complained about the ground not being as sharp it could, because the photoreal scenery depends a lot on scenery settings so, people with config problems, slow machines, wrong video settings, would see the scenery blurred, something that doesn't happen with our method. And, of course, using a native FSX photoreal scenery would prevent having rain effects on tarmac.
So, as I've said, this is the only compromise that allows very high res on ground, no blurries, good match with surrounding scenery AND rain effect on FSX, all at the same time.