Making unmovable tiles movable

I'm designing an RPG using mostly the cityscape terrain, is it possible to add snow to it somehow? (its an unmovable tile) I'm using UMSWE I dont trust Zepir's (no offense) but is there an slk I can modify?

lets hope somewon knows that would be usefull for me too

I'm pretty sure that it is impossible. There is definatly no trigger which even relates to the terrain. Sad though, this would be awesome to do.

-Insaniteus-

Woah wait... I think you can find a string for a tile. Then, just put the string for a useless unit. Now you have moving snow!

Insaniteus, your cinematic was god!

No I mean the unmovable tiles, like snow and stuff you cant put from 1 tileset to another