It is possible to change the degree of icing in certain cloud types (eg cumulus/thunder)
see thread
http://forum.1cpublishing.eu/showthread.php?t=31959
for some strange reason the default setting is full icing
You can play around with the user created clouds somewhat using these settings and get some nice effects with certain views- the limited draw distance being the limitation here (along with fps)
As a WIP it shows promise, and given there were ' a suprising amount of crashes' involving use of 'unsupported clouds' it appears that quite a few people want this feature, even in its current state,