"Maybe a panel to play with fog and clipping ranges 'live' would be useful as well?"

Of Course this WOULD be possible.. But don't forget, that it is your script.. And with a script you have endless possibilities..So if you change the cliprange or don't use the camera view in your script i can not change this with the Map Editor..

I could write a starter for sth. like this.. But as I said..Changing sth. which isn't saved in the WMP file can be overwritten by you in the Script.

Triple-X