Just what is it you want to customize?

Consider a simple 'snow in the mountains'. You can have

* early snow up north, the leaves have just started turning and the snow is on 
slightly yellowish trees up the slopes, no snow on green trees down
* one day later - a bit of snow is still on the ground but has dropped from the 
trees

* late snow - no snow on either slopes or valleys, but all leaves have fallen

* snowfall a while ago, then winds - snow on the ground both on the slopes and 
in the valley, but the wind has cleared the snow from the trees on the slopes 

* fresh snowfall in midwinter - both ground and trees are snw covered

(...) <add your other 10 different combinations here>

Each of these can occur - so how is FG supposed to know what you'd like to see? 
Well, we don't need to simulate all of them, but the point is - I actually want 
to simulate all of them, because I like the idea of having infinite ways to see 
the same scene.

Just how would you teach FG that the Netherlands are unlikely to be 
dust-covered, that autumn colors in Finland are never red, that German farmers 
tend to plough their fields before the winter so they appear earth-coloured in 
late fall, that tropical environments do not have four seasons, ... and at the 
same time consider plausible assumptions for what has happened the last few 
days?

If you start thinking about it, the problem doesn't really factorize into 
regional xml and pre-defined dropdowns. Allowing the user to use snow-covered 
textures in Hawaii (about which nobody complained so far - it's a bit telling 
that the glaring flaws of the current scheme never seem to be a topic, but the 
inevitable flaws of any novel idea immediately make it prominently into the 
discussion ) is as bad as allowing the user to set too strong vegetation decay 
because he is still south. If you really want a heuristics which drives the 
shader based on some understanding of vegetation patterns, you need a lot of 
additional parameters. A dropdown doesn't solve anything on its own.

* Thorsten
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