Already did it. Its in the "Collection". Multiple Fogs and Fogs can get Waves, well Fog Layer 0 anyway, the 2nd layer will show a distorted fog, but after going into the Menu, it doesnt stay.
Fix is on my "To Do" list as the "Collection" is getting a major upgrade adding in a ton of totally new stuff, a modular passable replacement which has enabled other scripts such as diagonal stairs, downhill ice, allowing NPC's on Event Tiles, restricting tile passages per character, restricting bush passages and total control over bush effects, hotfoot tiles, a Compass (already released), and something called "Vehicles" like Boats and Magic Carpets, caterpillar compatible too. Much is done but more to do. Still on the list is VXA backgrounds in XP and Im considering a Looping Map script which would allow for an Airship type Vehicle, and a Platform Script, compatible with every other script in the Collection. Ive been scripting my ass off!
If someone else wants to take a swing at making the distortion effects in additional fogs in Multiple Fogs Script stick, go for it. For me, its a bit on the backburner but planned.
(for the record, Im not zecomia)